Internet scale routing with NixOS (nixcon2025)

This talk will be in the format of an experience report. We will go over how to use the module system to declaratively manage BGP sessions, set up routing policies to manage traffic between hosts using addresses within advertised prefixes using systemd-networkd and nftables in a multi-upstream setup, and how to run a primitive anycast CDN. The talk will also include hiccups encountered while experimenting with the BIRD Internet Routing Daemon, Tailscale, and improvement plans. GitHub: https://github.com/stepbrobd/router about this event: https://talks.nixcon.org/nixcon-2025/talk/7YWTUC/