IPv6 NAT66 Behind a FritzBox: The RouterOS 7 Bug That Broke WiFi Clients (opens in new tab)

Originally published at woitzik.dev Most homelab IPv6 guides assume you have native IPv6 from your ISP: a delegated /56 prefix, clean RA on the WAN, no NAT. That describes maybe 30% of actual deployments in Germany. The other 70% sits behind a FritzBox with DS-Lite or CGN, gets a GUA on the WAN interface via SLAAC, and has no delegated prefix to distribute internally. If you want IPv6 inside your network, you build it yourself. This is the setup I run: ULA addressing internally, NAT66 masquer...