[wharvle]

Yeah, IPv6 is shut off on my Google Fiber router. Stuff on the Internet breaks when it’s on (last tested three or so months back when they sent me a new router).

When we first got Fiber, years ago, Amazon’s store was one of the things that broke until I turned off IPv6. Wouldn’t load at all, on any device on our network.

Works fine for VPNs and such, but I don’t talk to the Internet with it, because my experience has been it’s terribly unreliable.

[vel0city]

I'm curious what breaks with IPv6 on. I've been running IPv6 dual stack for over a decade at home and pretty much never have any issues. I think I've run into a prefix change get bugged on my router's announcements that required a reboot, but that's like 2 times in the last 10+ years and I'm not 100% sure that was truly the issue. My phone is pretty much always has an IPv6 address and pretty much never has IP-related connectivity problems. I'm not using Google Fiber's router though, so that could be the complication.

[wharvle]

The typical behavior is that DNS returns an IPv6 address, then whatever-it-is sits there until a timeout, because it’s simply not being routed. I’ve not investigated further because turning off IPv6 fixes the problem and breaks nothing (that I care about). Anything that only returns an IPv4 address from DNS works either way.

My cellular connection supports IPv6, but testing sites report it’s misconfigured in a bunch of ways. I don’t see problems in practice, though. But on my home network, it’s turned off.