using my local provider

TCP vs UDP

wk87 is a dangerous topic for me, i've been through a lot. I apologise for what I am about to inflict on this network over the coming week.

Most incompetent co-worker, candidate 1, "T".

T was an embedded C developer who talked openly about how he's been writing code since he was 14, knew all the C system libraries and functions like the back of his hand. For the most part, he did ... but not how to actually use them, as (based on his shocking ... well everything) he was inflicted by some sort of brain disorder not yet fully understood by medical science. Some highlights:

- Myself and the CTO spent 4 days teaching him what a circle buffer was and how to build one.
- His final circle buffer implementation had about 3 times as much code as he actually needed.
- When the code was running too slowly on the device, we didn't try find any performance improvements, or debug anything to see if there was anything taking too long. No not with T, T immediately blamed TCP for being inefficient.
- After he left we found a file called "TCP-Light" in his projects folder.
- He accused the CTO of having "violent tendencies" because he was playing with a marker tossing it up in the air and catching it.
- He once managed to leave his bank statements, jumper and TROUSERS in the bathroom and didn't realise until a building wide email went out.
- He once .... no hang on, seriously his fucking trousers, how?
- He accused us all of being fascists because we gave out to him for not driving with his glasses, despite the fact his license says he needs to (blind as a bat).

... why were his trousers off in the first place? and how do you forget ... or miss the pile of clothes and letters in a small bathroom.

Moving on, eventually he was fired, but the most depressing thing of all about T, is that he might not even be top of my list.

Tune in later for more practiceSafeHex's most incompetent co-worker!!!

Every IT admin's wish

You see a web, I see:

CLIENT: TCP SYN
SERVER: TCP SYN ACK
CLIENT: HTTP Get
SERVER: HTTP Response
...
CLIENT: TCP FIN
SERVER: TCP FIN ACK

All I’m saying is that this spider has a clear understanding of Transfer Control Protocol.

Due to Coronavirus (COVID19) all TCP applications are being converted to UDP to avoid handshake.

The ability to slap people through tcp/ip.

--- HTTP/3 is coming! And it won't use TCP! ---

A recent announcement reveals that HTTP - the protocol used by browsers to communicate with web servers - will get a major change in version 3!

Before, the HTTP protocols (version 1.0, 1.1 and 2.2) were all layered on top of TCP (Transmission Control Protocol).
TCP provides reliable, ordered, and error-checked delivery of data over an IP network.
It can handle hardware failures, timeouts, etc. and makes sure the data is received in the order it was transmitted in.
Also you can easily detect if any corruption during transmission has occurred.
All these features are necessary for a protocol such as HTTP, but TCP wasn't originally designed for HTTP!
It's a "one-size-fits-all" solution, suitable for *any* application that needs this kind of reliability.
TCP does a lot of round trips between the client and the server to make sure everybody receives their data. Especially if you're using SSL. This results in a high network latency.
So if we had a protocol which is basically designed for HTTP, it could help a lot at fixing all these problems.
This is the idea behind "QUIC", an experimental network protocol, originally created by Google, using UDP.

Now we all know how unreliable UDP is: You don't know if the data you sent was received nor does the receiver know if there is anything missing. Also, data is unordered, so if anything takes longer to send, it will most likely mix up with the other pieces of data. The only good part of UDP is its simplicity.
So why use this crappy thing for such an important protocol as HTTP?
Well, QUIC fixes all these problems UDP has, and provides the reliability of TCP but without introducing lots of round trips and a high latency! (How cool is that?)

The Internet Engineering Task Force (IETF) has been working (or is still working) on a standardized version of QUIC, although it's very different from Google's original proposal.
The IETF also wants to create a version of HTTP that uses QUIC, previously referred to as HTTP-over-QUIC. HTTP-over-QUIC isn't, however, HTTP/2 over QUIC.
It's a new, updated version of HTTP built for QUIC.

Now, the chairman of both the HTTP working group and the QUIC working group for IETF, Mark Nottingham, wanted to rename HTTP-over-QUIC to HTTP/3, and it seems like his proposal got accepted!
So version 3 of HTTP will have QUIC as an essential, integral feature, and we can expect that it no longer uses TCP as its network protocol.

We will see how it turns out in the end, but I'm sure we will have to wait a couple more years for HTTP/3, when it has been thoroughly tested and integrated.

Thank you for reading!

I feel like a fucking abomination at the moment.

I have been working on an app that is almost like Wireshark. More so for practice than anything else.

I decided that today I would try it out on the network here at my house, so I started the packet sniffer and wanted to see what was going on. I was checking for unencypted text (like telnet and whatnot) and came across this odd address that I hadn't seen before.

I did something that I shouldn't have done, and I fucking clicked and did the equivalent of "follow TCP stream" on wireshark. I fucking went and looked what the text being sent over this fucking network was.

It was my girlfriend, using fuck knows what messenger, but it was unencrypted. I just found out that she is cheating on me. I don't want to go into what the texts exactly say, because it fucking hurts me deep down.

Why didn't she just use whatsapp or something, fuck man. I really don't need this in life at the moment. I am genuinely trying to get my shit in order, I have been coding my ass off at night for extra money to make it, I have been working overtime where I can - fuck I have even tried sucking up to management (I would never do this under normal circumstances) - and to top this off, the motherfucking tax man is giving me hell.

Fuck sakes.

If you want to cheat, fucking do it properly. Because I am in a state of pure sadness and hatred and the moment - and I don't know what the fuck to do.

I'm pretty sure it was already posted in here, but I found it today

Did you get it?

So I decided to give Linux a try again.

Created live usb. Prepared myself to go through all the hassles at the beginning.

Booted in live USB. I can't see mouse cursor.

Searched in google, apparently a common problem with GTX 1070/1080 graphics cards.

Installed proprietary nvidia drivers with keyboard only. Took me about 20 minutes.

Finally managed to get the mouse cursor and install ubuntu. Time to boot and smell the fresh air of linux again.

Sound card doesn't work. Even the integrated mobo sound card doesn't work. Looked for a solution, found the bug in lunchpad but not solution yet. Everyone recommending to buy an external sound card.

I can't code without music. Decided to remove linux.

Booted back to Windows and removed linux partition. That fucked up my bootloader although I installed linux's efi loader completely separately.

Now I am sitting in front of my computer, with black grub screen, while trying to make a Windows 10 usb with my 7 years old broken laptop.

Next time I see a rant about Windows 10 that glorifies linux, I swear I'm gonna smack your face over standard TCP/IP

Hello, would you like to hear a TCP joke?

Yes, I'd like to hear a TCP joke.

OK, I'll tell you a TCP joke.

OK, I'll hear a TCP joke.

Are you ready to hear a TCP joke?

Yes, I am ready to hear a TCP joke.

OK, I'm about to send the TCP joke. It will last 10 seconds, it has two characters, it does not have a setting, it ends with a punchline.

OK, I'm ready to hear the TCP joke that will last 10 seconds, has two characters, does not have a setting and will end with a punchline.

I'm sorry, your connection has timed out... ...Hello, would you like to hear a TCP joke?

Are you ready to get my up vote
Yes I'm ready to get your up vote

A tcp packet walks in to a bar and says “I want a beer”, barman says “you want a beer?” and tcp packet says “yes, a beer” .

In high society, TCP is more welcome than UDP. At least it knows a proper handshake.

A bunch of TCP packets go into a bar, until it’s overcrowded. The next day, half as many go in.

A bunch of TCP packets walk into a bar. The bartender says, “Hang on just a second, I need to close the window.”

When I try to send SYNs to chicks, I don’t get any ACKs. Just FINs and RSTs.

IP packet with TTL=1 arrives at bar. Bartender: “Sorry, can’t let you leave…and you don’t get any beer either…” 

The worst part about token ring jokes is that if someone starts telling one while you are telling yours, all joking stops.

The great thing about TCP jokes is that you always get them.

The problem with TCP jokes is that people keep retelling them slower until you get them.

I would tell some UDP jokes too but I never know if anyone gets them

The best thing about UDP jokes is that I don’t care if you get them or not.

I had a funny UDP joke to tell, but I lost it somewhere...

The sad thing about IPv6 jokes is that almost no one understands them and no one is using them yet.

I tried to come up with an IPv4 joke, but the good ones were all already exhausted.

A DHCP packet walks into a bar and asks for a beer. Bartender says: “here, but I’ll need that back in an hour!

DHCP jokes only work when there is only one person telling them

The worst part of SSH jokes is that, even when they're not funny, you suck it up and just pretend they were anyway.

The problem with token ring jokes is you need to wait your turn to laugh

I’d make a joke about UDP, but I don’t know if anyone’s actually listening…

So this was a couple years ago now. Aside from doing software development, I also do nearly all the other IT related stuff for the company, as well as specialize in the installation and implementation of electrical data acquisition systems - primarily amperage and voltage meters. I also wrote the software that communicates with this equipment and monitors the incoming and outgoing voltage and current and alerts various people if there's a problem.

Anyway, all of this equipment is installed into a trailer that goes onto a semi-truck as it's a portable power distribution system.

One time, the computer in one of these systems (we'll call it system 5) had gotten fried and needed replaced. It was a very busy week for me, so I had pulled the fried computer out without immediately replacing it with a working system. A few days later, system 5 leaves to go work on one of our biggest shows of the year - the Academy Awards. We make well over a million dollars from just this one show.

Come the morning of show day, the CEO of the company is in system 5 (it was on a Sunday, my day off) and went to set up the data acquisition software to get the system ready to go, and finds there is no computer. I promptly get a phone call with lots of swearing and threats to my job. Let me tell you, I was sweating bullets.

After the phone call, I decided I needed to try and save my job. The CEO hadn't told me to do anything, but I went to work, grabbed an old Windows XP laptop that was gathering dust and installed my software on it. I then had to build the configuration file that is specific to system 5 from memory. Each meter speaks the ModBus over TCP/IP protocol, and thus each meter as a different bus id. Fortunately, I'm pretty anal about this and tend to follow a specific method of id numbering.

Once I got the configuration file done and tested the software to see if it would even run properly on Windows XP (it did!), I called the CEO back and told him I had a laptop ready to go for system 5. I drove out to Hollywood and the CFO (who was there with the CEO) had to walk about a mile out of the security zone to meet me and pick up the laptop.

I told her I put a fresh install of the data acquisition software on the laptop and it's already configured for system 5 - it *should* just work once you plug it in.

I didn't get any phone calls after dropping off the laptop, so I called the CFO once I got home and asked her if everything was working okay. She told me it worked flawlessly - it was Plug 'n Play so to speak. She even said she was impressed, she thought she'd have to call me to iron out one or two configuration issues to get it talking to the meters.

All in all, crisis averted! At work on Monday, my supervisor told me that my name was Mud that day (by the CEO), but I still work here!

Here's a picture of the inside of system 8 (similar to system 5 - same hardware)

You won’t get it. But I don't care.... :)

Hello, would you like to hear a TCP joke?

Me: Hey Dave, wanna hear a TCP joke?
Dave: Uhh, sure...
Me: OK I'll tell you a TCP joke..
Dave: Please don't.
Me: Are you ready to receive my TCP joke?
Dave:...
Me: OK I'm sending my TCP joke. It'll be 4 words long and 27 bits large.
Dave:... Screw this, I'm going home now.

Would you like to hear a TCP joke?

Navy story time, and this one is lengthy.
As a Lieutenant Jr. I served for a year on a large (>100m) ship, with the duties of assistant navigation officer, and of course, unofficial computer guy. When I first entered the ship (carrying my trusty laptop), I had to wait for 2 hours at the officer's wardroom... where I noticed an ethernet plug. After 15 minutes of waiting, I got bored. Like, really bored. What on TCP/IP could possibly go wrong?
So, scanning the network it is. Besides the usual security holes I came to expect in ""military secure networks"" (Windows XP SP2 unpatched and Windows 2003 Servers, also unpatched) I came along a variety of interesting computers with interesting things... that I cannot name. The aggressive scan also crashed the SMB service on the server causing no end of cute reactions, until I restarted it remotely.
But me and my big mouth... I actually talked about it with the ship's CO and the electronics officer, and promptly got the unofficial duty of computer guy, aka helldesk, technical support and I-try-to-explain-you-that-it-is-impossible-given-my-resources guy. I seriously think that this was their punishment for me messing around. At one time I received a call, that a certain PC was disconnected. I repeatedly told them to look if the ethernet cable was on. "Yes, of course it's on, I am not an idiot." (yea, right)
So I went to that room, 4 decks down and 3 sections aft. Just to push in the half-popped out ethernet jack. I would swear it was on purpose, but reality showed me I was wrong, oh so dead wrong.
For the full year of my commission, I kept pestering the CO to assign me with an assistant to teach them, and to give approval for some serious upgrades, patching and documenting. No good.
I set up some little things to get them interested, like some NMEA relays and installed navigation software on certain computers, re-enabled the server's webmail and patched the server itself, tried to clean the malware (aka. Sisyphus' rock), and tried to enforce a security policy. I also tried to convince the CO to install a document management system, to his utter horror and refusal (he was the hard copy type, as were most officers in the ship). I gave up on almost all besides the assistant thing, because I knew that once I left, everything would go to the high-entropy status of carrying papers around, but the CO kept telling me that would be unnecessary.
"You'll always be our man, you'll fix it (sic)".
What could go wrong?
I got my transfer with 1 week's notice. Panic struck. The CO was... well, he was less shocked than I expected, but still shocked (I learned later that he knew beforehand, but decided not to tell anybody anything). So came the most rediculous request of all:
To put down, within 1 A4 sheet, and in simple instructions, the things one had to do in order to fulfil the duties of the computer guy.
I. SHIT. YOU. NOT.
My answer:
"What I can do is write: 'Please read the following:', followed by the list of books one must read in order to get some introductory understanding of network and server management, with most accompanying skills."
I was so glad I got out of that hellhole.

Anyone looking for something interesting to do???

Step 1) understand how basic circuitry works on a bread board nothing too fancy. ( Implement NAND, AND, ADDER, SUBTRACTOR)

Step 2) learn about microprocessors and how OS works

Step 3) learn assembly

Step 4)write a basic assembler and understand how loaders and linkers works !

Step 5) write a kernel with very basic features like memory management and process management and some drivers for IO

Step 5) write an emulator for some simple systems .! ex chip-8.

Step 6) read about compiler theory and automata

Step 7) write a basic Python interpreter that compiles (not interpreter) to native assembly.

Step 8) implement TCP stack .

Step 9) learn as much as u can about complexity measurement ), data structures and algorithms using C or C++ it's very important ( familiarity with pointers and thus computer memory )

Step 10) learn any high level language of choice like Python or Ruby.

Step 11) stop debating over tabs vs spaces , emacs vs vim , angular vs vue, php vs Python , OOps vs procedular vs functional ( just know about all of them and when to use but don't fucking debate over which one is superior )..

Step 12) live happily and be healthy.

Eureka! The IBM 5150 is on the internet!

"Hi, I'd like to hear a TCP joke."
"Hello, would you like to hear a TCP joke?"
"Yes, I'd like to hear a TCP joke."
"OK, I will tell you a TCP joke."
"Are you ready to hear a TCP joke?"
"Yes, I am ready to hear a TCP joke."
"OK, I am about to send the TCP joke. It will last 10 seconds, has 2 characters, it does not have a setting, it ends with a punchline."
"OK, I am ready to get the TCP joke that will last 10 seconds, has 2 characters, does not have a setting, and ends with a punchline."
"I'm sorry, your connection has been timed out."
"Hello, would you like to hear a TCP joke?"

Prof: alright class our topic for the day is all about TCP. What's TCP?

Me: Our topic for the day.

When 500 ms have passed and you have not yet received the ACK

Ohhh tcp

Python: "I'm platform independent"
Me: "Cool, can you set the TCP keep alive to 1 second"
Python: "Go ask the OS lol"

Found on Twitter, by @MalwareTechBlog

That moment when you realise:
money != Happiness
Stickers === Happiness

"We don't need to invest in security - noone is going to hack us anyway" == "We don't need a fire department in our city - fire is not going to start here anyway"

We don't need to invest in security - everything is public anyway" == "We don't need a fire department in our city - our buildings are made out of straws anyway"

-- my thoughts after seing a line in client's spec: "sensitive data is transferred via a secure tcp channel (https) and all the public data is transferred via an unencrypted tcp (http) channel"

Too damn hilarious

Mother of god.

I spent hours and hours last week to try and get OpenVPN working. I mean, OpenVPN is working perfectly fine (on a VirtualBox (nope no vmware for me on servers) machine on a friends' dedicated server) but it wouldn't get through! As in, every forwarding/firewall rule just didn't work.

Was seriously about to lose my shit just now when I suddenly noticed the term 'TCP' in a forwarding rule.

Looked at the .ovpn file: proto udp

I added the exact same rule for UDP as a forward within VirtualBox.

It worked.

Well, there goes quite some hours 😐

And solely because I didn't realise that I setup a forwarding thingy for the wrong protocol.

I feel very stupid now :(

I would like to tell you a UDP joke, but you might not get it..

Experience that made me feel like a dev badass?

Users requested the ability to 'send' information from one application to another. Couple of our senior devs started out saying it would be impossible (there is no way to pass objects across a machine's memory boundary), then entertained the idea of utilizing the various messaging frameworks such as Microsoft's ServiceBus and RabbitMQ, but came up with a plan to use 2 WebAPI services (one messenger, one receiver) along with a homegrown messaging API (the clients would 'poll' the services looking for message) because ServiceBus, RabbitMQ, etc might not be able to scale to our needs. Their initial estimates were about 6 months development for the two services, hardware requirement for two servers, MSSQL server licenses, and padded an additional 6 months for client modifications. Very...very proud of their detailed planning.

I thought ...hmmm...I've done memory maps and created simple TCP/IP hosts that could send messages back and forth between other apps (non-UI), WPF couldn't be that much different.

In an afternoon, I came up with this (see attached), and showed the boss. Guess which solution we're going with.

The two devs are still kinda pissed at me. One still likes say as I walk in the room "our hero returns"....frack him.

Me: Why is there such a delay between the app and the hardware device?

Colleague: Ah, same old same old, TCP is just an inefficient protocol. We should stop development and build our own replacement to TCP.

(PS. The actual problem was his code)

~TCP~
A: SYN
B: ACK/SYN
A: ACK

~The French~
A: Ça va ?
B: Ça va / Ça va ?
À: Ça va

Unambiguity scores:
TCP - 1
French - 0

Some companies be like-

.. In job posting - We are the next big thing. We are going to change the industry. We are like Google / Facebook etc...

..in Introduction - We are the next big thing. We are going to change the industry. We are like Google / Facebook etc...

.. in Interviews - We are the next big thing. We are already changing the industry. Think of us like Google / Facebook etc...

.. during Interviews - Our interview process is rigorous because we are the next big thing. We are going to change the industry. We are like Google / Facebook etc...

.. questions in interviews - Since we are Google / Facebook, please answer questions on Java, C/C++, JS, react, angular, data structure, html, css, C#, algorithms, rdbms, nosql, python, golang, pascal, shell, perl...
.. english, french, japanese, arabic, farsi, Sinhalese..
.. analytics, BigData, Hadoop, Spark,
.. HTTP(s), tcp, smpp, networking,.

..

..

..

.. starwars, dark-knight, scarface, someShitMovie..

You must be willing to work anytime. You must have 'no-excuses' attitude

.........................................

Now in Salary - Oh... well... yeah... see.... that actually depends on your previous package. Stocks will be given after 24 re-births. Joining bonus will be given once you lease your kidneys.

But hey, look... We got free food.

Well, SHOVE THAT FOOD UPTO YOUR ASS.

FUCK YOU...
FUCK YOUR 'COOL aka STUPID PIZZA BEER - CULTURE'.
FUCK YOUR 'FLAT- HIERARCHY'.
FUCK YOUR REVOLUTIONARY-PRODUCT.

FUCK YOU!

TCP Jedi: Master, how are you?
UDP Jedi: Good i am.

credit:@AlgoRythm

This joke never gets old.. :D

I feel a bit bad when I reject most people after interviews - they'll do alright, just don't have the knowledge we're looking for.

Other people who fail interviews just piss me off.

If you're applying for a *senior* position, yet you tell me a race hazard is "what happens when concurrent applications are working efficiently", a GET request is "only ever used in a REST API", a POST request is "when you use TCP directly" and you can't write a single line of code in a new project because "in the real world we always just modify what's there already", then please sod right off. There comes a point when you clearly know bugger all, have extensively lied on your CV, and you're just trying to con your way into a position while hoping no-one notices.

Argh.

When people finish their rants with Fin I feel like I need to comment FIN-ACK to complete the TCP session.

Due to COVID-19 all TCP applications are being converted to UDP to avoid handshakes!

*tries to SSH into my laptop to see how that third kernel compilation attempt went*
… From my Windows box.

Windows: aah nope.

"Oh God maybe the bloody HP thing overheated again"
*takes laptop from beneath the desk indent*
… Logs in perfectly. What the hell... Maybe it's SSH service went down?

$ systemctl status sshd
> active (running)

Well.. okay. Can I log in from my phone?

*fires up Termux*
*logs in just fine*

What the fuck... Literally just now I added the laptop's ECDSA key into the WSL known_hosts by trying to log into it, so it can't be blocked by that shitty firewall (come to think of it, did I disable that featureful piece of junk yet? A NAT router * takes care of that shit just fine Redmond certified mofos).. so what is it again.. yet another one of those fucking WanBLowS features?!!

condor@desktop $ nc -vz 192.168.10.30 22
Connection to 192.168.10.30 22 port [tcp/ssh] succeeded!

ARE YOU FUCKING FOR REAL?!

Fucking Heisen-feature-infested piece of garbage!!! Good for gaming and that's fucking it!

Edit: (*) this assumes that your internal network doesn't have any untrusted hosts. Public networks or home networks from regular users that don't audit their hosts all the time might very well need a firewall to be present on the host itself as well.

UDP vs TCP

So I've been playing some DnD with friends.
And we've been working with some lego characters, whiteboard markers and plastic sheets to draw on.

But that's always a mess:
The ink was old and did not come off again for the most part
The sides of the map curled up and and made the lego character fall over
The lego characters were too big
And more...

So I thought, why not make it digital?

And so I did.
I used UWP to make a master and a client, both using the Windows Ink api to be able to draw.
Some circles with an initial served as characters, and everything was synchronized using a TCP library I wrote half a year ago.

Yesterday we tried it out.
We all (including me) were sceptical if it would work well because the 'analog' clumsy way we did it before does have a certain charm.

But at the end we were all very enthousiastic about it and we'll be using it next time too!
It's awesome to be able to create programs for your own use :D
That's why being able to program is such a great thing!

Now I need to restructure everything, make it more efficient, add a turn order display, make the map zoom- and moveable and more and more....

I have in my head parts of a game, I'd love to build. A top-down space colonization game. You control various spacecrafts and build spacestations etc. to expand your control.
The catch is that you have limited direct controls in-game. Most of the "gameplay" consists of having your own piece of software running somewhere, communicating with the API and controlling your colony.
Similar to Screeps, but I don't like the limitations of writing JavaScript and uploading it to the service. I'd love for the user to have free control of what language to use. They just need to be able to create a TCP socket and communicate with the API

*desolders Ethernet, USB and GPIO rails from Raspberry Pi to decrease height*
(Desoldering that shit from a Pi fucking sucks btw, no idea what solder or pads they use but it's garbage)
*boots up Raspbian to see whether it still works and to set things up*
...
Oh shit.. I need keyboard and mouse for this :') fuck me I guess... Long live planning ahead. Does there exist a KVM over TCP/IP yet? 😅

I hate interviewing..

The first sentence of the candidate was, that he wanted to speak in english instead of german. Great start if you stated something else in the application.

And his english was even worse than mine.

And as expected from his tags in the application, he had a broad knowledge base. From IoT, LTE, node.js TCP, Java, Ruby, Python, to VLAN and firewalls.

Guess what, he had no in depth knowledge for the required job. Suprise!

Not mine, but thought it was funny

IP in a bottle :D

Rant? I don't think so.

You know what, I'm out of devRant until Coronavirus is over. I can't take one more repost of the TCP UDP handshake shit.

!rant

I built my first android app, it sends TCP packets to my computer

neat

By heavens creating your own api server with the Go standard lib is so easy it should be fucking criminal.

Now....on to add authentication and a nice frontend stack(prob React) to make it all spiffy and show it to my manager and see if she lets me put this shit to use at work.

It will make it more interesting. It took me nearly 1 hour to get what I needed from the docs, build it using the net package first(das right babe, pure TCP) and just a couple of minutes more for net/http and boom. Ferching info and shit left and right

Man I love this shit. Wish I could do this for a living. Stuck fucking around with css, Java and php at work instead ;____;

First lecture of computer networks. Let's shove all of these abbreviations with their meaning, and possibly a associated port number in one 1.5 hour lecture:

HTTP, HTTPS, FTP, FTPS, SFTP, TCP, IP, UDP, ISP, DSL, DNS, LAN, WLAN, WDM, P2P, TELNET, PGP, TLS, SSL, SSH, MIME, SMTP, POP3, IMAP, IANA, DHT, RTT, DHCP

I really feel sorry for students who didn't have previous knowledge about this stuff..

TCP vs UDP...

FUCK LINUX

now that I have your attention, and you’re probably angry, too, please, even if you don’t read this rant, never use code.org again. now, onto the rant…

god dammit, code.org sucks. I mean, anyone who created it or associates with it should, well, be considered a terrorist. they’re bombing students futures in computer science with false, useless, bullshit information. not to mention, their sponsors like bill gates, mark zuckerburg, and other rich asses, talk in a video about some boring ass shit that is hard to understand for anyone who doesn’t program, and not to mention, they use a fucking five dollar microphone. ear rape. even if you look at a textual version of it, then read the information on it, it’s practically useless because it's so terribly explained, and also useless. ironically enough, they focus on their animations more than their actual explinations, or their students for that matter. the fact that we had to encode a picture in binary, made me about 50% dumber, give or take a 0 or 1. then, we had to do it in hex, which wasn’t really much better, although more realistic I supposed. what's really the most depressing thing about this class is its application in the real world. I've learnt nothing whatsoever that will help me in the real world, or in computer science. I suppose there's two things that may be useful (that I already knew): hex, and that TCP doesn't lose packets. that's it. those two things. five seconds worth of knowledge from the first quarter of the year. the ideas just make me want to throw up. teaching the main ideas of computer science without actually teaching it? one of the teachers (probably a good one) enrolled her students in an online programming course just so they could understand, because the explanations are just so terrible. this is the only [high school] computer science course offered by code.org, and I signed up because it's an AP computer science class (tried to get into AP Java, the day I was supposed to take the test to get into an upper level class, I was told it didn't count as a tech credit). seriously, fuck code.org. it makes you dumber. their 'app lab' environment is pointless, just like everything else. the app lab is basically where you have a set of commands and have to make a dog bark() or a storm trooper miss() [and that's hell when they haven't introduced while loops yet]. the app lab is literally code.org going out of their way to make everything that their students are learning pointless in the real world. seriously, why can't we just use a <canvas> like an ACTUAL PROGRAMMER would do if they were to make a browser game, not use an app engine so slow it would be faster to update windows and android studio each time I run an 'app' in their 'environment'. their excuse is that the skills "transfer over" to the real world. BITCH! IF I DIDN'T KNOW JAVA, AND I WANTED TO MAKE A GAME IN JAVA, I'M NOT GOING TO LEARN PYTHON, THEN "TRANSFER" THE SKILLS I LEARNT, I'M GOING TO LEARN FUCKING JAVA. AND THAT GOES FOR EVER OTHER LANGUAGE, PROJECT, ETC.

I'm begging you code.org, stop, get help.

“Hi, I’d like to hear a TCP joke.”
“Hello, would you like to hear a TCP joke?”
“Yes, I’d like to hear a TCP joke.”
“Ok, I’ll tell you a TCP joke.”
...

It has been bugging the shit out of me lately... the sheer number of shit-tier "programmers" that have been climbing out of the woodwork the last few years.

I'm not trying to come across as elitist or "holier than thou", but it's getting ridiculous and annoying. Even on here, you have people who "only do frontend development" or some other lame ass shit-stain of an excuse.

When I first started learning programming (PHP was my first language), it wasn't because I wanted to be a programmer. I used to be a member (my account is still there, in fact) of "HackThisSite", back when I was about 12 years old. After hanging out long enough, I got the hint that the best hackers are, in essence, programmers.

Want to learn how to do SQL injection? Learn SQL - write a program that uses an SQL database, and ask yourself how you would exploit your own software.

Want to reverse engineer the network protocol of some proprietary software? Learn TCP/IP - write a TCP/IP packet filter.

Back then, a programmer and a hacker were very much one in the same. Nowadays, some kid can download Python, write a "hello, world" program and they're halfway to freelancing or whatever.

It's rare to find a programmer - a REAL programmer, one who knows how the systems he develops for better than the back of his hand.

These days, I find people want the instant gratification that these simpler languages provide. You don't need to understand how virtual memory works, hell many people don't even really understand C/C++ pointers - and that's BASIC SHIT right there.

Put another way, would you want to take your car to a brake mechanic that doesn't understand how brakes work? I sure as hell wouldn't.

Watching these "programmers" out there who don't have a fucking clue how the code they write does what it does, is like watching a grown man walk around with a kid's toolbox full or plastic toys calling himself a mechanic. (I like cars, ok?!)

*sigh*

Python, AngularJS, Bootstrap, etc. They're all tools and they have their merits. But god fucking dammit, they're not the ONLY damn tools that matter. Stop making excuses *not* to learn something, Mr."IOnlyDoFrontEnd".

Coding ain't Lego's, fuckers.

Perfectly explained

I've optimised so many things in my time I can't remember most of them.

Most recently, something had to be the equivalent off `"literal" LIKE column` with a million rows to compare. It would take around a second average each literal to lookup for a service that needs to be high load and low latency. This isn't an easy case to optimise, many people would consider it impossible.

It took my a couple of hours to reverse engineer the data and implement a few hundred line implementation that would look it up in 1ms average with the worst possible case being very rare and not too distant from this.

In another case there was a lookup of arbitrary time spans that most people would not bother to cache because the input parameters are too short lived and variable to make a difference. I replaced the 50000+ line application acting as a middle man between the application and database with 500 lines of code that did the look up faster and was able to implement a reasonable caching strategy. This dropped resource consumption by a minimum of factor of ten at least. Misses were cheaper and it was able to cache most cases. It also involved modifying the client library in C to stop it unnecessarily wrapping primitives in objects to the high level language which was causing it to consume excessive amounts of memory when processing huge data streams.

Another system would download a huge data set for every point of sale constantly, then parse and apply it. It had to reflect changes quickly but would download the whole dataset each time containing hundreds of thousands of rows. I whipped up a system so that a single server (barring redundancy) would download it in a loop, parse it using C which was much faster than the traditional interpreted language, then use a custom data differential format, TCP data streaming protocol, binary serialisation and LZMA compression to pipe it down to points of sale. This protocol also used versioning for catchup and differential combination for additional reduction in size. It went from being 30 seconds to a few minutes behind to using able to keep up to with in a second of changes. It was also using so much bandwidth that it would reach the limit on ADSL connections then get throttled. I looked at the traffic stats after and it dropped from dozens of terabytes a month to around a gigabyte or so a month for several hundred machines. The drop in the graphs you'd think all the machines had been turned off as that's what it looked like. It could now happily run over GPRS or 56K.

I was working on a project with a lot of data and noticed these huge tables and horrible queries. The tables were all the results of queries. Someone wrote terrible SQL then to optimise it ran it in the background with all possible variable values then store the results of joins and aggregates into new tables. On top of those tables they wrote more SQL. I wrote some new queries and query generation that wiped out thousands of lines of code immediately and operated on the original tables taking things down from 30GB and rapidly climbing to a couple GB.

Another time a piece of mathematics had to generate all possible permutations and the existing solution was factorial. I worked out how to optimise it to run n*n which believe it or not made the world of difference. Went from hardly handling anything to handling anything thrown at it. It was nice trying to get people to "freeze the system now".

I build my own frontend systems (admittedly rushed) that do what angular/react/vue aim for but with higher (maximum) performance including an in memory data base to back the UI that had layered event driven indexes and could handle referential integrity (overlay on the database only revealing items with valid integrity) or reordering and reposition events very rapidly using a custom AVL tree. You could layer indexes over it (data inheritance) that could be partial and dynamic.

So many times have I optimised things on automatic just cleaning up code normally. Hundreds, thousands of optimisations. It's what makes my clock tick.

Protocol!

My tablet is lying on a table 2m away from me and I have to install a new app.. but I don't want to get out of my couch ffs! And I haven't configured dropbear in it yet, and neither do I have adb over TCP/IP. Well fuck it then. My desktop with BlueStacks.. hah, it's running fucking WanBLowS. No remote access there. Too much to ask of that certified pile of crap.

But the point is.. moar remotes, moar better 😋 anything to not have to stand up, taught by my ability to log into a server in Italy from the comfort of my couch. SSH and the sysadmin trade sure is nothing short of amazing ♥️

My first interview as a Java dev tomorrow! Wish me luck

Anyone else's blood boil when TV shows abuse tech terminology? Like the 'hacker' saying "connecting the virtual TCP to the neural net."

TCP / IP = ?

I wonder whether this is a bug in Chrome, or if it's just Google drawing the conclusion from my northern geo-position, that we still haven't left the stage of building longships, raiding England and Scotland, burning monasteries and writing awesome poetry and literature in weird characters sets.

Well, I'm not Ragnarr f*cking Loðbrók or Egill Skallagrímsson, so I can't read electronic component data sheets the way those guys did.

I'll go grab my chisel, so I can carve a bug report into a suitably flat stone and shove it down the TCP/IP series of tubes leading to Google.

Yaay, after several hours of tinkering I finally got a simple chat over TCP working in rust. I'm happy, I like rust :)

As we're all going about our various Easter, Passover, et al., family celebrations, I have the perfect solution to help train your families to stop asking you for help with mundane computer stuff:
Every time someone asks you to do/fix something, give them a full talk about what is going on in their computer around that system.
Don't forget you can talk about lots of things too:
- concurrency
- TCP IP / socket networking
- multi-threaded programs vs. single threads
- RISC vs. CISC processors
- Why linux is better than Windows or Mac
- algorithms
- logarithmic runtime
- teach them how to convert between hex, binary, and base ten
Really pour it on too. Soon they'll either figure out that you are a highly-skilled individual who is not their personal geek squad, or they'll be too afraid of a big lecture to ask for help.
Works with my in-laws like a charm.

Was forced to do some work on Windows this week (CAD tools that runs only on Windows). I spent a few days just setting up the tools. There were quite a few things I realized I forgot about Windows (as compared to Linux).

1) Installation times are down right horrific. What exactly are the installer doing for 10 minutes?
2) .NET is a cluster fuck. Not even Microsofts repair tool can fix it, but rather just hangs. I ended up using another tool to nuke it and reinstall.
3) Windows binary installs are insanely huge, thus, takes forever to download.
4) The registry is a pointless database that must have been written in hell with the single intent of destroying users will to live. The sole existence of the registry is another proof that completely incompetent engineers designed Windows.
5) Rebooting is the only way to solve many problems. This is another sure sign of a fundamentally fucked up OS design.
6) What the heck is wrong with the GUIs designers? The control panel must be the worst design ever. There are so many levels to get to a particular setting I'm getting dizzy. Nothing gets better by the illogical organisation.
7) Windows networking. A perversion of the tcp/ip stack that makes it virtually impossible to understand a damn thing about the current network configuration. There are at least 3 different places that effects the settings.
8) Windows command prompt. Why did they even bother to leave it in? The interpreter is as intelligent as retarded donut. You can't do anything with it, except typing "exit" and Google for another solution.
8) Updates. Why does it takes hundreds of updates per month to keep that thing safe?
9) Despite all updates that is flying out of Redmond like confetti, it is still necessary to install antivirus to keep the damn thing safe. That cost extra money, and further cost you by degrading performance of your hardware.
10) Window performance. Software runs like it was swimming in molasses. The final stab in the back on your hardware investment, and pretty much sends performance on your hardware back a few hundred bucks more.
11) Closed source is evil. If something crash consistently, you might find a forum that address the issues you have. Otherwise you're out of luck. On the other hand, it might be for the better. I imagine reading the code for Windows can lead to severe depression.

I'm lucky to be a Linux dev, and should probably not complain too much... But really, Windows, go get yourself hit by a truck and die. I won't miss you.

I wrote an application to demo at a convention coming up. Which feeds tcp data from arduino devices to real time d3 maps via websockets.

Demoing today, and the owner starts talking about a project he saw that which lit up some lights to a device in the room via the internet. In this same meeting he casually mentions he wish he had developers who could do that type of stuff.

The disconnect is massive and soul breaking.

That's how it all started ..

Wanna hear a TCP Joke? 😝

My grandmother started dating soon after granddad's death.
Death of Grandpa: fuser -k 80/tcp
Announcement to all programs, port 80 is now free

I was promised a three way and all I got was a TCP handshake. 😂

Network Security at it's best at my school.
So firstly our school has only one wifi AP in the whole building and you can only access Internet from there or their PCs which have just like the AP restricted internet with mc afee Webgateway even though they didn't even restrict shuting down computers remotely with shutdown -i.
The next stupid thing is cmd is disabled but powershell isn't and you can execute cmd commands with batch files.
But back to internet access: the proxy with Mcafee is permanently added in these PCs and you don't havs admin rights to change them.
Although this can be bypassed by basically everone because everyone knows one or two teacher accounts, its still restricted right.
So I thought I could try to get around. My first first few tries failed until I found out that they apparently have a mac adress wthitelist for their lan.
Then I just copied a mac adress of one of their ARM terminals pc and set up a raspberry pi with a mac change at startup.
Finally I got an Ip with normal DHCP and internet but port 80 was blocked in contrast to others like 443. So I set up an tcp openvpn server on port 443 elsewhere on a server to mimic ssl traffic.
Then I set up my raspberry pi to change mac, connect to this vpn at startup and provide a wifi ap with an own ip address range and internet over vpn.
As a little extra feature I also added a script for it to act as Spotify connect speaker.
So basically I now have a raspberry pi which I can plugin into power and Ethernet and an aux cable of the always-on-speakers in every room.
My own portable 10mbit/s unrestricted AP with spotify connect speaker.
Last but not least I learnt very many things about networks, vpns and so on while exploiting my schools security as a 16 year old.

Just talked to a guy who codes microcontrolers in assembler. He wants to use a raspberry pi as an interface device between TCP and Serial port. He asked me how fast that would run over internet and I told him that it depends on the connection an other things it takes at least some milli secs to transmit.
He is like:
What the fuck do you mean milli secs?
I poll data on my 20 mhz controler every like micro sec or so and that Pi got 1Ghz.

Me like: Yea go fucking code that shit on your own with ASM.

What does the year 2030 have in store for us?😂

When my first TCP program made contact with another computer.
That was glorious!

So here I am reinventing the wheel making an HTTP server in C.
Finished implementing HTTP/1.1 and WebSockets support and now I find out the current thingy is HTTP/2.
Well that's fine, I'll add support for that later. In fact I kinda dig it since it uses binary conventions instead of plain text ones.
I dig a little bit and find out there already is an HTTP/3 going around which uses UDP.
Why me.

This morning... Five hours of theoretical lesson of informatics, systems and networks!! :)
Let's Go! 💪

4 and a half years doing socket/network programming and I only just learnt my understanding of TCP was largely incorrect...

Well then... That's something...

It's been three weeks now that „SPRING“ is over and Nerdism won over our interior decorations. Neither wife nor friends and family noticed. But I do. Every morning. This time I made an impact to our decoration. This single time

My school blocks all UDP traffic going outside their network. 1 - 65535. Which in turn means that I had to switch to TCP for my VPN to connect. Now my VPN is slow as shit. -.-

This evening for curiosity i executed a nmap over my android phone expecting (like everyday) all port closed.
But i see
9080/tcp open glrpc
Wtf??
Let me check something....
--adb shell
$cat /etc/net/tcp

And the first line provied me the UID of the app that was running on 9080 port (2378 in hex)
So let me check which app is that
$dumpsys package | grep -A1 "userId=*UID*"

And the answer is com.netflix.mediaclient

Wtf??
Why netflix is running a http server on 9080/tcp on and android phone??

All sysadmins, PLEASE! For the love of God just block port 21 in any direction from anywhere, going anywhere.. FTP needs to die.. The f**king protocol predates tcp/ip for God's sake! We need to stop project managers using it, it's a nightmare!!

Image relevant.

Tried getting puter to talk, puter no want to talk.
Me sad.
Me tell puter to stay put and listen at 4444.

External device doesn't do shit.
Me sad.

Read the docs. Nothing. Written like a 5 year old would.

Be angry, how do I put external device into tcp/ip mode? No one knows, the docs don't know.

I get frustrated and pull the USB cable out of it.
Mfw it starts spitting out requests to my server with no end in sight.

Mfw the requests all just repeat.
Mfw the docs tell me to acknowledge a request I have to respond with a content type of
"application/x-www-form-urlencoded"
How.

Not possible.
Mfw I decide to dissect a request to check it's accept header.

Mfw it says text/plain.
Great, no idea in what format the thing expects it.

Try writing out query string plainly.

It fucking works.

Why can't people just learn to write proper documentation.

We converted all TCP APIs to UDP to ensure there are no handshakes...

UDP joke, I don't care if you get it.

Ok, first rant, about my struggles getting reliable internet over the past 6 years. It's not too interesting of a topic, but here we go:

I'm living in a more rural part of Germany and internet here is shit. I pay more than 50 bucks a month for 700kb/s downstream (let's just not talk about upstream...), which is meh by itself but it gets worse. Before this I had roughly 230kb/s downstream using DSL. My provider came out with a new oh-so-fucking-fancy solution for giving people faster internet without upgrading their lame ass fucking backbone and POS infrastructure from 70 years ago: they sell you hybrid internet which combines your shit DSL and an LTE connection using TCP Multicast. Not only do I get only 6 of my promised (and payed for) 50 Mbit, no, It's also a fucking piece of nonworking shit!!!

Let me illustrate:
You constantly have problems with web content (or any remote content) not loading because the host server does not support TCP Multicast. It either refuses connection altogether or it takes about 30-50 seconds to establish a connection. Think about your live when it takes two or three fucking minutes to load 5 YouTube thumbnails or load new tweets at the bottom of the Twitter page! Also, you never know if you a) have an error in your implementation of a new API or if b) the remote host doesn't support TCPMC (there's never an error for that! Fuck you!), your SSH sessions ALWAYS drop in the most inopportune fucking moments because the LTE thing lost connection, you always have to turn on a VPN if you want to visit specific websites (for example your school's website) and so on....

Oh and also, my provider started throttling specific services again these days with Netflix and YouTube struggling to display 240p, fucking 240p video without buffering when I get 600kbit down on steam (ofc the steam download is paused when watching videos). When using a VPN, YouTube 720p and Netflix HD work like a charm again. Fucking Telekom bastards

Then there is the problem with VPNs. The good thing about them is that they solve all the TCP Multicast problems. Yay. Now for the bad things:
First of all, as soon as I use a VPN, access times to remote go up by like fucking 500%. A fucking DNS lookup takes 8-15 seconds!!! The bandwidth is there but it takes forever.. because reasons I guess. Then the speed drops to DSL speeds after a while because the router turns off my LTE connection when it is unused and it does not detect VPN traffic as traffic (again because... Reasons?) And also, the VPN just dies after an hour and you have to manually reconnect (with every VPN provider so far)

And as if that wasn't enough, now the lan is dying on me, too, with the router (the fucking expensive hybrid piece of shit, 230 bucks..) not providing DHCP service anymore or completely refusing all wifi connections or randomly dropping 5Ghz devices, or.....

You get the point.

The worst thing is, they recently layed down 400mbit fiber in my neighborhood. Guess where the FUCKING PIECE OF SHIT CABLE ENDS??? YEAH, RIGHT IN FRONT OF MY NEIGHBORS HOUSE. STREET NUMBER 19 IS SERVED WITH 400MBIT AND MY HOME, THE 20, IS NOT IN THEIR FUCKING SERVICE REGION. Even though there is a fucking cable with the cable companies name on it on my property, even leading up to my house! They still refuse to acknowledge it! FUCK YOU!!!!

Well anyways thanks for reading. Any of you got the same problems? :/

IoT device endpoint: public fixed IP, raw TCP socket, no auth at all

Samsung Smart TV becomes Samsung Dumb TV.

Welcome back dear readers, to the next installment of my Raspberry Pi / Pi Hole / MitM box adventure!

For those of you who are new to this story, I'm a long experience programmer who knows very little about his home network or networking in general and has constantly been going over his 250GB data plan because 'rona, and thus, wants answers to "where is the data going".

So, I got the Pi, codenamed Mini-Beowolf, positioned between the modem and router... worked some fuckin systemd.networkd magic (which was sort of easy... but was hard cause I'm new to it) and viola, this son of a bitch passes through the ethernet and doesn't even show up on the router. Fu-King Beastly, I love it.

Now to static IP all my devices so I fire up my trusty TP-Link admin portal. I should add here... I've visited this admin about a total of 10 minutes prior to this when I set this wifi router up and just let it do DHCP.

So I'm getting to know my admin portal... I've got most of my devices connected to reserved IPs... and I find this one fuckin device reporting as "localhost".

Now, I've got a MAMP install... but it hasn't been running. But still I thought for sure it was just MAMP run a bit amok.

But no... it was my fucking Samsung "Smart" TV. That piece of shit is, and apparently has been reporting its device name as, sure as shit, fucking "localhost"... PROBABLY FOR YEARS.

Now, IDK how that didn't cause me any major problems over the years, and I read quite a few forums about people who it did mess up their network. So I resolved to rename the Samsung TV device.

I found the spot in the network settings of the TV... I changed the name from the pick list of rooms in a house like "Living Room" and "Bed Room", then I tried entering my own device name. But no matter what I picked, or no matter how many times I restarted/reset that TV the network name is ALWAYS "localhost".

Even though somehow my network survived this long... I'm not standing for that shit.

My Samsung TV is now blocked COMPLETELY at the router level. (After I ran one last factory reset and update)

The kicker? That Pi I built has a Samsung SSD... so I'm blocking Samsung WITH FUCKING SAMSUNG.

Needless to say, these are likely among my last Samsung purchases.

Join me next time when I FINALLY try to turn Pi Hole on and then get a tcpdump (or some other lesser output from the tcp stream) going.

When some other team wants to blame us because they're getting a HTTP Status Code 0....

That's not even a valid status... IT MEANS YOU ABORTED THE REQUEST AND KILLED THE CONNECTION...

OH STILL OUR FAULT... WELL DO U KNOW ABOUT NETWORK ISSUES AND SERVER OVERLOADING WHEN U SPAM IT WITH TOO MANY REQUESTS?

OH YOU RETRIED? HOW DID YOU RETRY? BETTER NOT BE SPAMMING US WITH MORE REQUESTS...

EVER HEARD OF TCP/IP BACK OFF LOGIC....

Bash

Has pretty much everything you may need, except for a TCP/UDP server functionality.

I mean, if it has a built-in TCP client -- why not create simplistic TCP server?
WHY???

CS Teacher today:
"Transport Layer provides Security and Encryption to the communication" (TCP/IP stack)

me: WTF? Encryption is provided on the *top* of the transport layer (aka Application) ( and below [Network Layer] there is IPsec)

Teacher: no, it's wrong.

me: so Wikipedia it's wrong, RFC 5246 is wrong, and you have right?

Teacher: Yes.

me: Ok. (aka fuck you!)

So client wants an android app that implements some legacy Epson printer SDK, works on a chinese Windows device with an android Emulator on it, connects to local Webservice that had to be configurated and ran (local Network) , sends and tracks data, if Server down then handle it on the Client and reconnect as soon as Server up, running own TCP Server on Android device that listens for specific http requests, which make the android connect to an Epson printer to start printing. The stuff that is being printed? A png file that has to be converted to a Bitmap, a QR Code that has to be generated by the bugged base64 encrypted stuff coming via http in (webserver-> Android TCP server)
Dont forget the Software Design (MVP), documentation, research etc.. Im about to finish the app , its my 5th day on this Project, the 6th day was planned to be full testing. Client Calls me and ask me how far I am, I reply, he says ok. 30 minutes later he tells me he wont pay me next time that much because this work should take 3 days, or even 2. "A senior Android developer could do this in 2 days"... When i sent him my notices he called me a liar, his webdev has alot of experience and told him it should take 2-3 days...ffs

!rant seems that my raspberry pi serial idea is a little bit complex at the moment and may take a more serious turn later, but I have studied and found DOS based TCP/IP software that will allow me to use my 5150 with actual Ethernet. There are a few 8bit ISA Ethernet cards that will work in the 5150 and separate executables that will configure DHCP, DNS, and even allow me to use a terminal emulator and SSH to connect to *nix based computers over lan! I'll keep you all posted!

Ok... Now the fun stuff can begin :)

*revving chainsaw noises*

Today I started nuking leftover project code.

At the end, some projects shrunk by roughly up to 40 % .

Can anyone explain to me why programmers have such an awful hoarding syndrome?

Why do you keep shit that might unleash complete havoc cause it hasn't been touched since years and noone knows id it still works?

It's like having a leg with gangrene and keeping it cause "it doesn't look that bad".

For fucks sake. Clean up and remove shit when it's not necessary anymore.

Reason why I did a bloody gore massacre in nearly a dozen projects... After all the rework of networking, it's finally evident which projects have a bad / nasty behaviour of "fucked up" connection handling (HTTP 1.1).

And when my gory massacre removal goes life, I think 25-35 % of persistent connections on the loadbalancers will vanish. Maybe even more, since some very nasty stuff was in some projects.

Like "let's implement monitoring without having any clue about how monitoring works and even less clues about how TCP/ HTTP works."

*Bangs devs heads on table*

Stop. Doing. Stupid. Things.

For fucks sake.

:@ :@

FUCK YOU FUCKING AZURE FUCKING FUNCTIONS:

EITHER LIMIT MY NUMBER OF TCP CONNECTIONS (before violently crashing)

or

FORCE ME TO USE THE GODDAMN PORT-PISSING, BARELY-MULTITHREAD-USABLE, SETTINGS-IGNORING EXCUSE OF A PATHETIC BUILT-IN HTTPCLIENT ON FUCKING CRACK (Seriously .net people fix that shit).

But not both... both are not okay!

If your azure function just moderately uses outgoing Http requests you will inevitably be fucked up by the dreaded connection exhaustion error. ESPECIALLY if using consumption plans.

I Swear, every day i am that much closer to permanently swearing off everything cloud based in favor of VM's (OH BUT THEN YOU HAVE TO MAINTAIN THE VM's BOO HOO, I HAVE TO BABYSIT THE GODDAMN CLOUD INFRASTRUCTURE AS WELL AT LEAST I CAN LOG IN TO A VM TO FIX SHIT, fuck that noise)

I am in my happy place today. At least I'm having great success diving into minecraft modding on the side, that shit is FUN!

The most crazy issue I've fixed was caused by a TCP behavior which I didn't know, called the "half-closed connection".
There was a third-party application installed on a production server which called a LDAP server for retrieving users information. During the day we had several users using the application and all worked fine. During the night, when the application was not accessed, something happened and the first call to the application in the morning was stuck for about 5 minutes before returning a response. I tried to reproduce the issue in a testing environment without success. Then I discovered that the application and the LDAP server were located on two different networks, with a firewall between them. And firewalls sometimes drop old connections. For this reason network applications usually implement a keep-alive mechanism. Well, the default LDAP Java libraries don't set the keep-alive on their connections. So, I found a library called "libdontdie", which force the keep-alive on the connections. I installed the library on the server, loaded it at the startup and the weird stuck behavior in the morning disappeared.

Old Days

I do some robotics stuff on the side. We built our robot around a Raspberry Pi last year. We had 2 Python scripts talking over TCP, one for the bot, one for the controller. Overflowed the buffer on the bot and it went berserk once the script crashed.

It was in old days when I was working in java and windows systems.

Java and different log4j versions across dependencies caused system not working only on production server.

Turned out some of libraries got log4j embedded and conflicted with other log4j.

It worked in all computers except production one.

Actually that was my main reason to switch my career to python after that dependency hell.

Another one was windows server 2008 tcp connection limit set to 200 or something.
We needed to change registry to get our servers working. After this case we finally managed to convince people to switch to linux.

Anyway any non standard error when you got multiple layers communicate with each other is hard, practice make it easier to solve those problems as your success moment comes faster.

What's the best part about TCP jokes? I get to keep telling them until you get them.

Here's something I'm sick of seeing: server software documentation that doesn't fully list what ports they are using. Too often I've read things like this: "AcmeServe uses ports 400, 8001, and 8002". Great, but why are you making me guess if those are TCP or UDP?

And sometimes it's: "AcmeServe uses ports 400 (UDP), 8001 (TCP), and 8002 (TCP)". Soooo, which ones do I port forward? Are you really going to make me have to use netstat -a to find out?

I can't understand the mentality behind that. They obviously realise you need to setup firewalls, but they half-arse it by only telling you the port numbers but not the protocol and/or if they're inbound/outbound.

Please, list what protocol the port is and if it's listening or outbound. Oh, and consider also mentioning where the port numbers come from in your config files, so I don't have to go playing a guessing game with a bunch of XML files should someone have overridden the default port numbers.

All good things come in small packages. Some TCP and some others IP.

So today I've had the idea of implementing Node.JS in Python because I love Node.JS but sometimes I hate the whole ".JS" part of it. It will be a fantastic learning exercise with TCP sockets and such, and will be good for learning the more intricate parts of Python as well.

Excited for Nodepy!

The first rule of networking: You can't claim that a message had been received until you have heard the reply.

Isn't Perl a beutiful language? Just check the beutiful screenshot of a function I just written...

Also this is so beutiful. Did you know that you can actually print directly from a perl script?:
$qp = new PostScript::Simple(papersize => "A4",direction => "RightDown",coordorigin => "LeftTop", colour => 0, eps => 0, units => "pt");
$qp->newpage;
$qp->setfont("Courier", 20);
$qp->text(20,20,"Hello Devrant");
$psock = IO::Socket::INET->new(PeerAddr => "192.168.1.40", PeerPort => "9100", Proto => "tcp");
if ($psock) {
$psock->autoflush(1);
print $psock $qp->get();
close($psock);
}

Some of my colleagues are dumb as fuck! I changed the text on a button and now they are not able to work with the program anymore! i wish i could implement "headnut over TCP/IP"... BAM, BAM!!!

Walked up to my girl and dropped this:
"Hey baby, are you a TCP Connection? Cause you look like a SYNACK"

Oh yeah, WOOOOOOOOoooo!

I would like to call out the moron who decided to control docker through HTTP when the maximum time the server can take to finish the task is longer than the HTTP timeout.
If you expect things might time out, you don't use a HTTP request. You use a resource and poll it, or Websockets, or possibly SSE.
Shoehorning your API into a frame that obviously doesn't fit doesn't help anyone. Just admit that you don't know what HTTP is and use a regular TCP socket with regular pings.

Tcp vs Udp

PSA: If you do reverse proxying stuff, prefer unix domain sockets over localhost internet sockets, if it's on the same machine (and if it's forwarded over ssh too). You can even serve HTTP as a unix socket.

Unix domain sockets don't have the overhead of IP, so generally speaking, data will flow to your other process with much less overhead.

I've recently stopped being lazy at this, and it's worth it.

So I just spent 2 hours debugging a script that fetches data from an API. Thats all it was supposed to do. Http get some data.

It wasnt working and was giving a "parse error". Worked fine in browser.

So it turns out it was using http 0.9 (first documented http version, defined in 1991) and wasnt sending any headers. And js cant do no headers...

So yea I now have to write a tcp / http 0.9 client in js

Since my ISP doesn't allow port forwards on that port, does anyone want to open their port 445 (if not otherwise occupied by Microsoft-DS) and have netcat reply an empty string or so any request (such as an empty string) sent over TCP (or has anyone already done so)? It would help me out a lot with testing out some networks full port range (since portquiz.net's hoster blocks that port) and would take close to no bandwidth for you.

boo-yaa!!! It's the 4th day in a row!

I accidentally glance at the clock and it says 1521.

Oracle must be speaking to me.

Setting up npm private registry and mirror is like setting up machine for handling ddos attack.

Last time I was tuning linux kernel tcp ip stack by adjusting default variable values was ages ago but if you see 100 open sockets in a matter of second after you try to install single frontend dependency you start questioning your life.

It's getting spooky

For a considerable number of days in a row, I randomly glance at my clock and it says 15:21.

Oracle is stocking me!!!!!!

So I was talking microservices architecture with some lead techs.
And I started asking how did they combine/connect their microservices.

And despite having a lot, they use HTTP as the main transporter.
So the put some API-Gateway, all inside traffic has to go through it, to connect to the final client.

And I said that I do meshing microservices, and we use Nats as man transporter, so our messages go through UDP and not TCP.

And they freaked out. Saying UDP is too low level and not useful...

My question: if you do microservices oriented architecture, and not SOA, do you use HTTP? Did you use it simply because "it works"?

I know it's been said in a comic before but..

The power to punch people over standard TCP/IP

Fuck TCP!

It must be good to at least know computer networking?! I remember nothing about these TCP, UDP, whatever the fudge protocol shite. I don't remember these megabit and megabyte things. All I do is code from one end to another. Anyone else watched Eli The Computer Guy's series?

AMQ cluster is misbehaving.. Master is constantly dying, slave is starting under root rather than app account, connection to AMQ DB takes 20-40 seconds (while queries execute in <0.1sec and TCP probe takes <0.01sec to succeed), monitoring is down,...

I mean it's gotta be the virus - what else could it be.

Today I have created a server application on Python Tornado which can forward TCP Packets directly to HTTP request queue without any intermediate caching.

Our remote IOT devices (microcontrollers with sensors attached) send sensor reading over TCP Socket to our server and all the connected web applications can show the data instantly using long polling and the above mentioned technique.

I just had to join in on this. First post. Hi everyone :>

Ancestors of TCP 😂

Fucking remote db doesn't want to work with me and workbench. DB is on an empty test server, no firewall issues on the network, powershell on my pc says ping ok, tcp failing though, server firewall not running, server up and running.
Tried to modify network access on db configs like bind-adress, set my db user "host" value to wildcard. Now I can log in on workbench with my user, yet root somehow fails, wtf?
And of course once the connection is live, no db us visible, accessible, nothing works. I'm so frustrated. About to nuke it and restart ... again!

Any good async (if possible, also pipeline based) Networking libraries for C++ on Linux? I want to create a small Server which should be able to handle a big amount of TCP connections (~500) at the same time, using threadpools maybe, something like Netty for Java would be the best.

I‘m currently writing a http proxy server (something like the proxy mod in Apache, but more special). One the one hand is is nice that HTTP 1.1 can use one TCP connection multiple times, but on the other hand it is very annoying. Because I need to rewrite the Host header. And therefore I need the start of the HTTP header. I solved it after some time, but now my code is more complicated than before.

TCP Keepalive. That's all, keep me alive.

Perfect! (Copyright : some Facebook page)

I saw this today. That's one way of ensuring that you take the medicine

so remember how I said I was sending TCP packets? screw that

UDP is life

That moment when full-stack web development suddenly includes troubleshooting the TCP connections on your new listener.

#rememberthatoneclassinundergrad

I never thought staring at Bluetooth pcaps would make me miss staring at tcp/ip pcaps

I never studied CS. This was probably around 2004 (I was 10), I just got my first own computer. I used to mess around with HTML and JS previously, like making obnoxious marquees and so forth, but then I met this guy on DC++ who taught me the basics of VB. Before that I'd always thought of people who could make compiled exes as magicians, and I suddenly became one of them. It was a very empowering moment. While others were playing, I coded apps such as a geometry calculator for school, a TCP chat program (not as cool as Zuckerberg's), and so on.

The beginning of the TCP/IP

## Learning k8s

Interesting. So sometimes k8s network goes down. Apparently it's a pitfall that has been logged with vendor but not yet fixed. If on either of the nodes networking service is restarted (i.e. you connect to VPN, plug in an USB wifi dongle, etc..) -- you will lose the flannel.1 interface. As a result you will NOT be able to use kube-dns (because it's unreachable) not will you access ClusterIPs on other nodes. Deleting flannel and allowing it to restart on control place brings it back to operational.

And yet another note.. If you're making a k8s cluster at home and you are planning to control it via your lappy -- DO NOT set up control plane on your lappy :) If you are away from home you'll have a hard time connecting back to your cluster.
A raspberry pi ir perfectly enough for a control place. And when you are away with your lappy, ssh'ing home and setting up a few iptables DNATs will do the trick

netikras@netikras-xps:~/skriptai/bin$ cat fw_kubeadm
#!/bin/bash

FW_LOCAL_IP=127.0.0.15
FW_PORT=6443
FW_PORT_INTERMED=16443
MASTER_IP=192.168.1.15
MASTER_USER=pi

FW_RULE="OUTPUT -d ${MASTER_IP} -p tcp -j DNAT --to-destination ${FW_LOCAL_IP}"

sudo iptables -t nat -A ${FW_RULE}

ssh home -p 4522 -l netikras -tt \
-L ${FW_LOCAL_IP}:${FW_PORT}:${FW_LOCAL_IP}:${FW_PORT_INTERMED} \
ssh ${MASTER_IP} -l ${MASTER_USER} -tt \
-L ${FW_LOCAL_IP}:${FW_PORT_INTERMED}:${FW_LOCAL_IP}:${FW_PORT} \
/bin/bash
# 'echo "Tunnel is open. Disconnect from this SSH session to close the tunnel and remove NAT rules" ; bash'

sudo iptables -t nat -D ${FW_RULE}

And ofc copy control plane's ~/.kube to your lappy :)

Another 'fun' rant

Wrote a new server application and got the request from customer services to make it compatible with a slightly older DB version.

Today, CS asked me to install everything on the customer's test environment so I made a build and installed it there.

Wanted to run the service, no .Net framework 4.7.1 installed. Fine, download the installer ...

Start installing .Net framework 'unsupported OS'. Started looking into it. Customer is still running an old unsupported Windows Server 2008 ...

Asked some colleagues whether this was normal. Apparently, yes.

Seems CS isn't capable of telling customers to at least have a supported windows version when they want our software. As if security issues due to people here not understanding TCP/IP isn't enough, we now have security issues due to old, unsupported Windows versions.

Note to self: never trust anyone who says that 'security is the most important thing in our software enviornment'.

Made a root only app: enable/disable GPS, mobile data, airplane mode and etc. work on not rooted device(yes all these functions work too).

How: Desktop app which downloads cross-platform ADB drivers, unzips them, executes a few commands, deletes the drivers and voala.
P.S: I use local ADB TCP connection(yeah I ported a part of the drivers for java android) and write_secure_settings granted with 'pm grant'.
And everything is user-friendly with screenshots explaining how to enable ADB and how to click a 2 buttons.

Automate this!

I'm an aspiring coder working some chappy administrator job just to pay the bills for now. My boss found out that I may actually be more computer literate than I let on.

Boss: "I want you to make X happen automatically if I click here on this spreadsheet"

Me "X!? That means processing data from 4 different spreadsheets that aren't consistently named and scraping comparison info from the fronted of the Web cms we're using"

Boss: "if you say so.. Can you do it?"

Me: "maybe.. Can I install python?"

Boss: "No..."

Me: "what about node.js or ruby?"

Boss: "no.. I don't know what you're talking about but you're not installing anything, just get it done"

Me: "Errm Ok.."

So here I am now, way over my head loving the fact that I'm unofficially a Dev and coding my first something in Powershell and vb that will be used in business :)

Sucks that I still have to keep my regular work on target whilst doing this though!

So I was looking into phone app development again (as you do) and I'm working on a simple QoL app for me and my SO that will help us automate some home management and finances stuff. Naturally I delved down the rabbit hole deep and wanted to have push notifications so we don't have to check the app periodically to know when certain things happen... Oh boy... Why is mobile development so convoluted, especially if you don't want to rely on Google Services...

It seems that the most accepted way of doing this is Firebase (FCM). Well me being me, I refuse to use google services for this and I prefer self hosted solutions (for data privacy reasons) which eliminates most products out there.

It also didn't help that my framework of choice is Flutter/Dart, because fuck Android Studio and the insane buggy XML stuff and fuck Android and it's constantly changing APIs...

Well In the end I decided on a rather simple solution and self hosted an AMQP service (RabbitMQ in my case, as I have some experience with it already) and implemented a foreground service in android platform specific code on top of my flutter project to kickstart it and made my phone a queue listener... This now means I can push notifications from my server to the Messaging Queue and it will be pushed into my App automatically!

One thing I found out on this journey was that Android now kills most background services and enforces foreground services to have a visible notification in the status drawer... which I actually approve of. It's a bit annoying that you can start a reliable background service, but I'm absolutely on-board with long running processes started by my apps are constantly visible...

Long story short, I love reinventing all the wheels, especially if it's for free and private... And I also went to sleep at 2AM again because this took longer that I'd like to tune... but it works, and it's google free...

I'm thinking of trying to package this up as a flutter module later, but first I want to do testing on battery life and the general life cycle of the service. RabbitMQ says they have the client library optimized for long-lasting connections and it should be just using a tcp socket, which should pretty much be what all the push notification services are doing anyway. I'm also not completely satisfied with how the permanent notification looks.. it isn't collapsible like some of the other ones from other apps and it's about 2 lines high instead of single line... which is something quite annoying and I'm struggling to find any relevant docs on how this is done other than possible making a custom Notification Style... but I just can't believe that everyone is doing that.. there must be a built-in somewhere -_-... Ugh Android is hell...

Anyway, if any android devs here have some hints, tips and tricks on how to handle this type of background/foreground process stuff and I'm doing something wrong let me know, cause googling this shit is a nightmare too!

I know this is not StackOverflow but is there a way to send TCP packets using JavaScript? I can't find a pretty solution. Why I can't find an API like "sockets" from Python to JavaScript?
Telnet API will be fine too.

Thanks!

Keep going into application level timeouts and insufficient number of xml messages frames transmitted through tcp sockets.

Found that a "custom" C-written xml parser needs 10 seconds to find the core data within 2500 chars of that xml.

I knew that C is blazing fast but that's until it's used by some dick head.

Hey ya'll back with another college boi question.

I want to develop a web server akin to that of jackbox/among us. Where each session has like an 'ABCXYZ' style code, and i assume are using TCP sockets on the back end.

I'll be writing in Go cause I <3 Go and its a chad language. Anywho, am i supposed to spin up a new websocket server each time someone wants to make a room? Or do i have one websocket server and some sort of map of rooms.

gameRooms := map['id_string']clients

Anyone have any suggestions for this?

Make your code available for your team members, please.

So we're working on this robotics project using ROS, a framework that enables multiple nodes in a network exchange their functionality among each other through tcp connections. Each node can be implemented and executed on your own machine, and tested with dummy inputs, but in collaboration they make a robot do fancy stuff.

The knowledgebase needs data from the image processing unit, providing this data to others with semantic context to high level planning, which uses this semantic data for decision making and calling the robot manipulation node with meaningful input, to navigate the robot's components in the environment. We use a dedicated machine, which pulls the corresponding repositories and is always kept configured correctly, to run each node, such that everybody has access to each other's work when needed.

So far so good. We tried to convince the manipulation guy (let's call him John) to run his code on our central machine, not a week, but since the first day, 5 months ago. Our cluster classification has been unavailable for 2 months, but my collegue fixed that. We still can't run the whole project without John's computer. If his machine blows up we're fucked.

Each milestone feels like a big-bang-test, fixing issues in interfaces last-minute. We see the whole demo just moments before our supervisors arrive at the door.

I just hope he doesn't get hit by a truck.

iptables -I INPUT -p tcp --dport 22 ! -s 192.168.1.0/24 -j RUSSIAN_WARSHIP_GO_F_URSELF

Please God let someone finally implement TCP/IP over punchcard with mechanical routers.

I've been writing on this TCP server the last few days to integrate our software with some services used by the rest of the company.
Noticed the company service keeps making a new connection for every single message, and closes this at client side (without signifying the server).

So I contact the team who wrote these services and ask them what's happening. Team lead of that team doubts that I know what I'm talking about and tells me TCP automagically signals the server on disconnect, and this probably is a .Net only problem.

5 seconds of googlefu: half open tcp connection.

Apparently, the application doesn't care about dropped connections and losing connection states even though every service should be checked for licensing when connecting to the server. With this set-up everyone can just send a message other than the registration and pass through any 'validation' due to the fact there can be no connection state.

F*CKING INEPT IDIOT(S) OF TEAM LEAD/DEVELOPER TEAM!

I don't know if many rememeber me but at one point this year I had to turn UDP basically into tcp, handshake, packet ordering, resend on failed, ACK response, and 4k bit aes encryption. Fucking done, it works, signed the last version and pushed to client, client loved it, just what he wanted, paid out contract then turned around and asked me to setup his server for one day with no further expectations and an extra 250, said sure don't mind, as I am setting shit up I decided to test if his business isp really blocks tcp, guess what? NOPE IT WORKS JUSY FUXKIJG FINE AND I COILD HAVE KUST RIPPED A PREMADE CORE AND GOT PAID AND SET IT UP AND HE WOULD NEVER know, but maybe theirs some weird circumstances that require the core to be made only with udp, so after I was done I asked why only udp if his line allowed tcp? Requirements maybe? NOPE HE JUST DOSENT UNDERSTAND TCP FUUUUUUUQQQQHDJDIOAJEJDICJDNXIKZMZJDJCU

I have to take UDP and add packet ordering, filter in, and resend and some form of handshake, because client couldn't figure out how to change the port from UDP to TCP and refused any help

Recent VM/Emulation Adventures:

The goal was to get TCP/IP and SSH running on whatever weird VM/emulated machine, and connect to the chatroom at chat.tcp.direct successfully.

Longhorn, somewhere late pre-reset: Crashes right after installer begins "Starting Windows", 0x7b from sum-match ISO. Fail.

TempleOS (well, Shrine, but y'know): Dear god. No. No, I am not writing SSH in HolyC myself *fuck that,* fail.

Slackware: oh ffs i gotta use fdisk to partition this damn thing? and it's not even the good fdisk? Oh, wait... it hangs. Fail.

WinME: shockingly, was *fairly* stable... until it hung up WASAPI and the hypervisor two frames into desktop rendering. Fail.

Mac OS 7: First-boot after install, immediate unknown trap. Just works, eh? Fail.

Amiga: After about 85 resets and 7 hours of constant fighting with WinUAE, I finally got TCP/IP working. (Required 10MB of total RAM and an FPU to connect.) Success!

Win98FE: just... PuTTY and done. Easy. (This was the warmup.) Success...

Other people's achievements so far:

- Minecraft using the new QEMU interface mod thing.
- Hacked smart fridge.
- iPhone, from custom initramfs.

So i recently inherited some legacy code.
Its actually not to bad. Just a few thousand locs which are mostly stretched across a handfull of functions lmao (800lines per function yay).

So the main thing i wana ask. Does someone here know of good techniques to gradually reimplement all of this.
Since im not gonna apply bandaids to this mess anymore than is needed.

Unfortunately this is a very important system and it only runs on production xD.

Idealy i would somehow be able to duplicate the tcp traffic to the reimplementation but that doesnt seem feasible.

Also what the individual modules classes and so on do wa snever documented and no one even knows how or why certain things even exist.

If anyone has any idea of what i can do. Apart from hoping to god i dont miss any weird quirky edge cases. Do let me know

Tl;dr:
My stupid ass needs a break, also a good english lesson, sry for grammar errors.

# rant.start()
You may want to ask how it is to be kind of stressed. I'll tell ya.
I'm half way through my semester and all of my profs had the same idea: projects. Huge ass projects for everyone with the smallest possible time to finish them. Also i'm moving in a new flat in a few weeks. Shove your projects up your fucking bleached arsehole and put a huge cork right beneath it.
I started to wonder why my stupid tkinter application started freezing after implemeting a thread for a small tcp module.
Confusion.
Frustration.
Hate.
Chaos.
Crying for help.
Zergrush on SO.
Realizing i used thread.run() instead of thread.start() .
Fml, i need a summer break.

Is there a better way communicating between php and java than tcp? Because this was my first idea but i try everything on localhost and the request takes up to 3 seconds...

How come I only hear about tcpsvd now....?

Ooohh myy, here comes the tunnel maze!!! :)

We had C project in school about multi-process communication and syscalls. We worked in groups of three.
I made a "framework"(header file) with important prototypes and definitions of needed variable sizes.
One of group member decided to null his variable by bzero syscall (writes null bytes). He ignored my framework and typed literal "sizeof". Ofc nulled double the needed value and it nulled another variable with some TCP packet also.
Spend week trying to find what is wrong with it.
I hate group projects.

FUCK YOU NAGLE AND YOUR DUMB ALGORITHM!!! AND EVERYONE AT WHATEVER COMPANY DECIDED THAT DISABLING IT IS NOT SOMETHING THEY SHOULD IMPLEMENT!! WHAT THE FUCK MAN

So I was just thinking scenario wise how if I founded a military organization who’s aim was to depose an insane dictator from power while remaining undetected including from all his insane supporters how I would use Linux

After I took every source package offline and modified and source checked it and disabled the ability for it to use regular tcp ip for anything but tunneling

The reasoning ? I just installed one program and it downloaded 40 some extra packages that I have no idea what are doing

Linux is great but do we actually know what the software is doing ? Same as windows only you can’t compiler that from scratch

It’s either trust a bunch of random people or trust a bunch of random people part of an evil company

Not the best of choices

But oh how beautiful it would be after I had 500 people pick every last package apart with a reasonable deadline of 2 years entirely offline at frozen versions

Then we could fork all the projects
Or only implement very carefully source reviewed patches transported via offline medium To computers that are running vms to house and test all additional patches so if it blows up we just copy our raw frozen image back over it and either scrap or repair the change

As connecting to the internet in general is not an good idea for silent running

Just wanted to do some scripted image resizing for school in school because the teacher asked me to help her with that.
So I thought: Let's just write a tiny script. Written the script in almost no time (just iterates over all jpg's and resizes them)

30sec.

Now I tried to run it. Didn't have my laptop so I had to somehow run it on their windows PCs. At least it's windows 10, unlike other schools that still run XP and stuff so I thought it might be doable. Well guess what, nope it wasn't.

First tried to install imagemagick, that didn't work as only teacher accounts have admin and the teacher was already pretty scarred once he saw me doing stuff in powershell so I thought I'd better not ask to do this via a teacher account and mess with stuff as admin.

Next method: Installing msys2. That worked at least (after taking forever to install and having to mess with the av software to get it to run).
And there comes the next problem: pacman doesn't connect via the proxy so I can't download any packages. There is free wifi but only for teachers, and students aren't going to get access until the school finally has a faster connection because they'd (understandably) cause this connection to be constantly overloaded. I just happen to have access to this wifi network, too, because at least the guys from the IT dept know how bad using proxies under linux is. So I connect via wifi and it works. At least I thought: After running the script it yields weird errors about unsupported arguments even though the command is exactly the same I have been using for years (already checked typos twice)

Then got the idea of simply installing imagemagick on termux on android and transferring the files onto my phone.
Too bad we aren't allowed to attach our own USBs to the pcs. Luckily I got a rooted phone so I simply activate adb over network and connect to it.
After downloading the platform-tools I can't run them because of AV software. Luckily there is an option to add an exception per executable so I do that. After doing that it works.... nope it doesn't. The wifi only allows 443/tcp and 80/tcp, even for internal network devices.

So that's it. I'm simply going to upload that stuff to my nextcloud and convert it at home.

Windows, I hate you!!!

I’ve got a really good TCP/UDP joke to tell you, but I don’t know if you’ll get it

Ugh... I don't like how TCP is a stream protocol and how UDP is unreliable and unordered.

I want a semi-reliable, ordered, message protocol dang it!

Is there a cloud service that does nothing but redirect incoming HTTP requests to your home server without the need to have a static IP or an open TCP port ? Sort of like proxy

I started my new job. Apparently I am responsible for "Transfer Services" and the networking equipment installed in the plant.
The system works in the standard way that Warehouse Management Systems talks to one of our TS servers and they give instructions to underlying controllers, It's some kind of tcp relay. Does anyone from you worked on this layer? I am trying to find some resource on the internet about windows server running this kind of service can't find anything. I would like to do some research and prepare adequately. Would be nice to hear your opinion. Thanks.

Would it be possible to use (S)FTP protocol in conjunction with push technology rather than pull? Perhaps websockets since both use TCP?

Say, something like an external server periodically sending my server files and when a new file arrives, I will get a notification. This instead of constantly polling my directory to check if there are files in it.

I think I can see this done with an Angular page that gives me a notification when a new file arrives on my FTP.

I think it might turn into an interesting little hobby project..

open plain TCP socket with javascript in browser, websockets are stupid

So I’m going through a CKAD course. There is a section about checking the status of our Pods or the application running in it through Readiness/Liveness Probes— they mostly use an HTTP test, but there is a TCP option as well. My question is, how will the TCP test work on HTTP/2 given that it does not have TCP (it rather uses QUIC)? Sorry if this is a dumb question.