Category: Networking

Residential VDSL2/PPPoE connection with a Juniper SRX

I have gotten my hands on an older Juniper SRX 300. Lacking a better use case, I determined this could be a reasonable home router for my VDSL2 connection.

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Bird 1.6: The Unofficial Guide

We all know the lovely routing daemon called Bird. However, the official documentation can be a bit lacking and daunting. Here’s my collection of useful examples

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Juniper EX4200 – Issues with route filtering

Issues with EX4200 – RPD_RT_PREFIX_LIMIT_REACHED: Number of prefixes (16384) in table inet.0 reached configured maximum (16384).

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Deciphering Traceroute rDNS

Ever wondered what “xe” means in traceroutes?

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Vultr List of Transits – 2020/10

Once again, I compiled a list of Vultr transits per location into a spreadsheet

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Vultr List of Transits – 2020/06

Once again, I compiled a list of Vultr transits per location into a spreadsheet

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Having fun with unusual IPv4 formats

Did you know that “2130706433” is a valid IPv4 address, and pinging it from major OSes will yield a positive result? Let’s look into how it works.

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Linux system as an IXP router

While it is possible to use a Linux based router in an internet exchange setting, there are some tweaks one has to make in order to not cause any trouble.

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DHCP server on a /32 subnet

How to force a DHCP server to hand over /32s, while running on a different /32 subnet.

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ECMP problems between two systems

Solving a tricky problem with ECMP between two machines, where one system refused to balance connections at random intervals.

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