I recently tested the 6to4 IPv6 support in the latest AVM Firmware for Fritz!Box Fon WLAN 7270. Now I tried to setup a tunnel to SixXS which failed during my first tests. The Fritz Box didn’t complain about the fact that my SixXS tunnel didn’t have any subnet allocated. Once a subnet was added to my tunnel, the Fritz!Box was able to setup the tunnel. I had my tunnel set to “6in4-heartbeat”, I haven’t tested “AYIYA”. I also found another IPv6 enabled website: ripe.net, quite obvious at second view 😀