WAN Failover für Ubiguiti Unifi mit Raspberry Pi – Laub-Home Wiki
Raspberry Pi 2b as a home router with Cisco switch and VLANs – Jan Taczanowski's tech blog
Amazon.com: GeeekPi Raspberry Pi CM4 Router Board,Raspberry Pi Compute Module 4 Expansion Board Breakout Board Module for Raspberry Pi Compute Module 4 Series : Electronics