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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?
Topics /
Networking & Internet
The most popular blog posts about networking & internet on Hacker News. 1,615 posts.
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Https hurts users far away from the server
Welcome to my personal blog! I use it to share what I'm currently learning or thinking about, usually on topics related to technology, business, and health.
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Faster Linux 2.5G Networking with Realtek RTL8125B
Since the Raspberry Pi Compute Module 4 was introduced last year, I've been testing a variety of PCI Express NICs with it. One of the main types of NIC I'm interested in is cheap 2.5 Gigabit Ethernet adapters. 2.5 Gigabits is about the highest reasonable bandwidth you can get through the PCI Express Gen 2.0 x1 lane on…
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VyOS From Scratch – Edition 1 (set up your own router)
As a VyOS evangelist, maintainer, and more, I’ve been meaning to write a simple series of “how-to” guides for VyOS for a while. Sure, there are plenty of guides out there, but I think a lot of them fall short in demonstrating WHY you are entering specific commands.
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IP over Lasers
Mike Kohn's music, software, and electronics projects.
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Wireless attacks on aircraft instrument landing systems
Wireless attacks on aircraft instrument landing systems Sathaye et al., USENIX Security Symposium 2019 It’s been a while since we last looked at security attacks against connected real-world entiti…
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Why updating DNS is slow
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Configuring Split Horizon DNS with Pi-Hole and Tailscale
Post describing how I've configured pihole to return different results to clients on my tailnet than those on the LAN.
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The History of Usenet and FidoNet
Between roughly 1975 and 1995, access to computers accelerated much more quickly than access to computer networks. First in the United States, and then in other wealthy countries, computers became …
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Globally Distributed Elixir over Tailscale
The result of my exploration of Elixir clustering and automating global network discovery and connection over Tailscale.
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Searching for "semicolon injection" bugs in embedded Linux devices
Introduction I recently bought a D-Link DCS-2121 surveillance camera. This is good stuff: Megapixel camera + microphone + speaker WiFi,...
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Each socket should have two file descriptors
What if, instead of running a process-data program on this machine, we want to run it on another machine? No problem. We make a TCP connection to a process-data server on the remote machine. On the local machine, we have generate-data writing to the TCP connection, and consume-data reading from the TCP connection…
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Splitting the Ping
Ping is one of the fundamental pillars of networking. It’s simple, universally supported, and is normally one of the few things that is shipped with all network stacks.
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HTTP/2 interop pains
At around 06:49 CEST on the morning of August 27 2014, Google deployed an HTTP/2 draft-14 implementation on their front-end servers that handle logins to Google accounts (and possibly others). Those at least take care of all the various login stuff you do with Google, G+, gmail, etc. The little problem with that was…
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Roughtime: a protocol for secure, auditable time synchronisation
Security protocols often assume an accurate, local clock (e.g. TLS, Kerberos, DNSSEC and more). It's a widely accepted assumption when designing protocols but, for a lot of people, it just isn't true. We find good evidence that at least 25% of all certificate errors in Chrome are due to a bad local clock.
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Computer Networking Introduction: Ethernet and IP – Heavily Illustrated (2021)
What is a LAN? What is a network segment? How are L1, L2, and L3 segments related? What does it take to send an IP packet from one host to another? What is the difference between LAN, VLAN, and VXLAN?
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Cert Authorities Check for DNSSEC from Today
From 15 March 2026, CAs must validate DNSSEC on CAA lookups and ACME checks. I've run DNSSEC for 14 years; see if your registrar supports it.
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This is the mail system
This is how we tell hundreds of millions of computer users that something has gone wrong:
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Modern Wardriving (2023)
Let’s start by defining the word Wardriving: it is the search for WIFI wireless networks from a vehicle equipped with a computer. This would be the classic definition. I define modern wardriving as the search for WIFI networks, Bluetooth devices … Continue reading →
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