Posts that commenters keep linking to, ranked by how many different people have cited them in Hacker News comments. 197 posts.
The Internet is a dangerous place in the best of times. Sometimes Internet engineers find ways to mitigate the worst of these threats, and sometimes they fail. Every now and then, however, a major …
One of the hot features that came with HTTP/2 was PUSH frames. The main idea is that if the server can predict what requests a client might want to make, the server can preemptively send request/response pairs to the client and warm its cache.
Posted by Nick Johnson | Filed under bittorrent , lt-codes , damn-cool-algorithms , fountain-codes
Motivation Despite using a FTTH internet connection since 2014, aside from the one fiber uplink, I had always used network gear with 1 Gbit/s links over regular old rj45 cat5(e) cables. I liked the simplicity and uniformity of that setup, but decided it’s time to add at least one fiber connection, to get rid of a…
New APIs, capabilities, bugs, and challenges for Safari and PWAs running in iOS 15.4 and iPadOS 15.4, including Web Push Notifications, WebXR
I have said before that I believe that teaching modern students the OSI model as an approach to networking is a fundamental mistake that makes the concepts less clear rather than more. The major reason for this is simple: the OSI model was prescriptive of a specific network stack designed alongside it, and that…
Telegram, the encrypted messaging app loved by terrorists, has been in the news lately. Terrorists have long used existing commercial and…
In my article detailing the command line utilities available for configuring and troubleshooting network properties on Windows and Linux, I mentioned some Linux tools that, while still included and…
Part of my series countering misconceptions in space journalism. Now available in audio form. Starlink, SpaceX’s plan to serve internet via tens of thousands of satellites, is a staple in the…
Protocol is a command-line tool to display ASCII RFC-like protocol header diagrams for both existing network protocols or user-defined ones (using a very simple syntax). Protocol is written in Python and it's open-source software.
A few years ago I wrote [_The World in Which IPv6 was a Good Design_](https://apenwarr.ca/log/20170810). I'm still proud of that article, bu...
The hidden disconnects of ZeroMQ can be dangerous if you don’t write your application to work around them.
The Brazilian television show “Fantastico” exposed an NSA training presentation that discusses how the agency runs man-in-the-middle attacks on the Internet. The point of the story was that the NSA engages in economic espionage against Petrobras, the Brazilian giant oil company, but I’m more interested in the tactical…
How many web servers are running on your machine right now? Do all of those development web servers have a secure login, and restrictive CORS permissions? You don’t know? Allow me to check for you:
Details about accelerated mobile pages and their numerous issues
Dear mastodon.technology community,
It took a while, but I finally managed to create my own Game Boy cartridge. With WiFi! At this point, it can only demo a simple telnet-style communication and access Wikipedia articles, but I am confident that I will showcase more in the future. For now, the interesting and surprisingly tricky part is how the thing…
init7 recently announced that with their FTTH fiber offering Fiber7, they will now sell and connect you with 25 Gbit/s (Fiber7-X2) or 10 Gbit/s (Fiber7-X) fiber optics, if you want more than 1 Gbit/s. While this offer will only become available at my location late this year (or possibly later due to the supply chain…
Websites are scanning for open ports on your PC to help fight fraud, but this data also flows into a massive, global tracking database.
The big news in crypto today is the KRACK attack on WPA2 protected WiFi networks. Discovered by Mathy Vanhoef and Frank Piessens at KU Leuven, KRACK (Key Reinstallation Attack) leverages a vulnerab…
Writing your own TCP/IP stack may seem like a daunting task. Indeed, TCP has accumulated many specifications over its lifetime of more than thirty years. The core specification, however, is seemingly compact[^tcp-roadmap] - the important parts being TCP header parsing, the state machine, congestion control and…
