After some years of absence I'm happy to have found my way back to the GrapheneOS ecosystem. Thank you so much for that wonderful work.
I just installed GrapheneOS on a Pixel 9A build 2025102801. Being in my home network I don't get IPv6 connectivity but it is crucial for me.
I see my device has multiple IPv6 addresses on wifi but I cannot reach ipv6 only hosts on the internet nor in my local lan. In the wifi settings I see multiple IPv6 addresses bound to my phone. I can also ping that IPs from my computer. The wifi settings only show a default gateway for IPv4 though. Via termux I verified that my dns resolves AAAA as well. Yet, when I try to ping a v6 only host it just says "unknown host" in termux. wtf is going on? Isn't GrapheneOS not IPv6 capable out of the box?
Switching wifi off using cell I get v6 connectivity no problem. It seems it's only wifi. I have PLENTY of other devices on my LAN that works with v6 no problem, it's only the grapheneOS device having problems.
With adb shell I was able to find out the phone simply doesn't have an IPv6 default gateway. Honestly seems to me like a bug.