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(All) DNS Resource Records
Just how many weird Resource Records can you stuff into a zone file? And what do these weird RRs actually return?
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The latest blog posts to take off on Hacker News. 1,615 posts.
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25 Gigabit Linux internet router PC build
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…
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BGP in a Nutshell
PhD student at University of Texas at Austin 🤘. Doing systems for ML.
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Download speeds: What Do 2G, 3G, 4G and 5G mean?
There are four types of mobile internet connection: 2G, 3G, 4G and 5G. We compare the real-world impact in terms of speeds and download times.
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Let's code a TCP/IP stack (2016)
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…
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ISP announces 86% slowdown “in line with others”
Altice wins the race to the bottom.
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PipeWire Under the Hood
The PipeWire project is slowly getting popular as it matures. Its documentation is still relatively sparse but is gradually growing. However, it's always a good idea to have people from outside the project try to grasp and explain it to others in their own words, reiterating ideas, seeing them from their own…
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I made 50k calls to explore the telephone network
Post describing my research wardialing Finnish freephones.
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URLs: It's Complicated
Let's play silly games with URLs...
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Freenode commits suicide, is no longer a serious IRC network
Since this happened after I was banned from Freenode , I didn't get to observe this first hand, but this is the situation as I now understand it.
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Raspberry Pi WiFi to ethernet bridge
The goal is to connect a non-WiFi computer to a WiFi network using a Raspberry Pi. We will use a Raspberry Pi 4 Model B as a bridge between the non-WiFi computer and the WiFi network. The Raspberry Pi connects to WiFi and shares its connection with other computers over Ethernet. These instructions were only tested and…
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Anatomy of a Linux DNS Lookup
Since I work a lot with clustered VMs , I’ve ended up spending a lot of time trying to figure out how DNS lookups work. I applied ‘fixes’ to my problems from StackOverflow without really understanding why they work (or don’t work) for some time.
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Freenode IRC operators now engaging in routine abuses of power
There have been several allegations of this since the handover of the Freenode infrastructure to its new custodians, but I can now provide a first-hand account of one incident — because I am the victim of it.
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Setting up a Raspberry Pi with 2 Network Interfaces as a simple router
I needed a very basic 'Internet sharing' router setup with one of my Raspberry Pis, and I thought I'd document the setup process here in case I need to do it again. I should note that for more complex use cases, or where you really need to worry about security and performance, you should use something like OpenWRT…
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Observing my cellphone switch towers
One of my favorite books is 2013 "High Performance Browser Networking" by Ilya Grigorik. Besides a wealth of actionable advice, the book is illustrated with captivating real life stories.
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My multi-decade quest for rural broadband
No corporate parables or historical insights this week, just the odd and sometimes amusing tale of the author's multi-decade quest for internet connectivity.
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Tracking One Year of Malicious Tor Exit Relay Activities (Part II)
>25% of the Tor network’s exit capacity has been attacking Tor users
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Dear EU: Please Don't Ruin the Root
I love Europe, and I want to see the European Union succeed. I also love the Internet, and I want to see it thrive as well. And it therefore pains me that it now appears that the European Union might inadvertently be picking an ugly fight with “The Internet”. UPDATE: I am EXCEPTIONALLY happy to report that through…
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Hunting down the stuck BGP routes
BGP is the glue between all of the thousands of border routers that make up the internet (you can find this post (battleships) and this post (EvE) as a crash course on how BGP works).
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Curl those funny IPv4 addresses
Everyone knows that on most systems you can specify IPv4 addresses just 4 decimal numbers separated with periods (dots). Example: 192.168.0.1 Useful when you for example want to ping your local wifi router and similar. "ping 192.168.0.1" Other bases The IPv4 string is usually parsed by the inet_addr() function or at…
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5G: The outsourced elephant in the room
This article is part of a series on (European) innovation and capabilities. In a break from the usual GPS/Galileo, DNA and C++ posts, here is a bit on 5G and national security. It turns out that through PowerDNS and its parent company Open-Xchange, we know a lot about how large scale European communication service…
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Go HTTPS Servers with TLS
This post is a basic introduction to running HTTPS servers and clients in Go using TLS. It assumes some familiarity with public-key crypto. Feel free to check out my earlier posts about RSA and the Diffie-Hellman Key Exchange ; TLS uses the elliptic-curve version of Diffie-Hellman. I won't be covering how the protocol…
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Setting up Starlink
In March, I got an email from SpaceX saying Starlink was available at my address, and I could pre-order. I paid $500 for the equipment, plus $25 for a Volcano Roof Mount, and $99 for the first month of service, and a few weeks later, I got the kit you see in the image above. I was a little too excited about getting…
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Was the NE2000 really that bad?
Over the last few months I have been on and off digging into the history of early PC networking products, especially Ethernet-based ones. In that context, it is impossible to miss the classic NE2000 adapter with all its offshoots and clones. Especially in the Linux community, the NE2000 seems to have had rather bad…
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VNC client running on a coffee machine
Published: 08-04-2021 | Author: Remy van Elst | Text only version of this article
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My NAS exposes itself over the internet without permission
The Terramaster NAS decided to expose itself to the public internet without asking. Let's see what we can do about it.