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OpenBSD Router Guide
NOTE: Currently this guide only deals with IPv4 as most people still don't use IPv6 and many ISPs also still only use IPv4, but IPv6 is planned for a future update of the guide.
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The latest blog posts to take off on Hacker News. 1,615 posts.
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Monitor Airplane Traffic with a Raspberry Pi
Learn how to monitor airplane traffic with a Raspberry Pi. Track real-time flight data using PiAware and an ADS-B dongle. Simple setup for aviation enthusiasts!
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DKIM: Show Your Privates
If you’re like most people, there’s a good chance that it’s been years since you’ve sent an email that wasn’t cryptographically signed. You don’t use PGP, you say? Well, even if you are…
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NAT Slipstreaming
exploit NAT/firewalls to access TCP/UDP services bound to any system behind victim's NAT
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5Gbps Ethernet on the Raspberry Pi Compute Module 4
tl;dr: I successfully got the Intel I340-T4 4x Gigabit NIC working on the Raspberry Pi Compute Module 4, and combining all the interfaces (including the internal Pi interface), I could get up to 3.06 Gbps maximum sustained throughput. Update: I was able to boost things a bit to get 4.15 Gbps! Check out my video here…
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Twitter preconnects to the wrong domains
Twitter tried to reduce load times for external links, but made things slower instead. It mistakenly normalizes domains to a point where they’re no longer useful.
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Say goodbye to resource-caching across sites and domains
A look-back at caching strategies from the past; with recent changes in Chrome's and Safari's caching strategies, there is no caching benefit from using publicly available third-party libraries anymore.
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AWS NLBs and the mixed up TCP connections
One of my services was running into timeouts, because connections were being reset by clients. I had assumed that it couldn't be the Network Load Balancers (NLB
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AWS and their billions in IPv4 addresses
Earlier this week, I was doing some work on AWS and wanted to know what IP addresses were being used. Luckily for me, AWS publishes this all here https://ip-ranges.amazonaws.com/ip-ranges.json. When you go through this list, you’ll quickly see that AWS has a massive asset
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Galileo's Ground Segment Problem
The European Global Navigation Satellite System Galileo has recently been suffering from frequent "almost disruptions", most likely partially due to Corona, and possibly also due to Brexit, but in any case due to some historical stinginess. Before I explain what is going on, I should hasten to say that most days of…
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iOS 14 USB tethering broken on Linux: looking for docs and contact at Apple
iOS 14 USB tethering broken on Linux: looking for documentation and contact at Apple
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How to Improve Bluetooth Audio Quality on Linux
Bluetooth Audio on Linux is a bit of a mess. There's a fair bit you can do to significantly improve the quality though.
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When thebiglebow.ski is blocked by Facebook
A website with The Big Lebowski quotes was blocked for no reason by Facebook. Looking for justice at a tech company that has automated the…
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Show HN: I reverse engineered my cable modem and turned it into an SDR
A few weeks ago I got curious about an old cable modem sitting in my closet, a Motorola MB7220. Initially I was interested in what kind of hardware it had and if it was running Linux. Some quick searching brought me to a thread on a web forum where people were discussing the built in spectrum analyzer feature used for…
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Moving your SSH port isn’t security by obscurity
I just came across another post on Hacker News talking about why you shouldn’t move your SSH port off of 22 because it’s Security by Obscurity. Ther
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Creating a Home IPv6 Network
One of the recent experiences of Linux Plumbers Conference convinced me that if you want to be part of a true open source WebRTC based peer to peer audio/video interaction, you need an internet address that’s not behind a NAT. In reality, the protocol still works as long as you can contact a stun server to tell you…
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Fuck Cloud Messaging
Ever tried to send a push notification to your phone? How hard can it be? I was surprised when I tried to push a simple push notification without involving a third party. It's not just hard they have made it near impossible to send a simple push notification without subscribing to their service. Moreover it doesn't…
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How Do Routers Work, Really?
An accessible overview of how exactly a router works, with code examples.
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Intercepting Zoom's encrypted data with BPF
How to use Rust and BPF to intercept the data sent and received by programs that use OpenSSL.
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Hacking Ethernet out of Fibre Channel cards
This story, like another in the past , started as an eBay purchase that I would soon regret. I was scrolling through my favorite eBay supplier when I found a listing titled Job Lot Of Roughly 350 Various Network Cards . This of course piqued my interest. Some close photo inspection identified a whole load of cards in…