By the way, you can use a separate Linux box (if you have any) to announce your ULA and DNS using radvd. Just remember to set AdvDefaultLifetime to 0 or else yo

By the way, you can use a separate Linux box (if you have any) to announce your ULA and DNS using radvd. Just remember to set AdvDefaultLifetime to 0 or else your devices will attempt to route their packets to the Linux box. It was what I did when I had a router that announced only public IPv6 prefixes to the LAN.