There's no way to know for sure if it works unless we start enabling it and look for these weird edge cases. We should be fixing the bugs we find during this pr

There's no way to know for sure if it works unless we start enabling it and look for these weird edge cases. We should be fixing the bugs we find during this process. That's why IPv6 adoption is painful, and why I think documentation would help a lot. Check if you have options inet6 set in your /etc/resolv.conf, and remove the option if you do. You can also try setting options single-request and options single-request-reopen. Note that the latter two violate the "don't enable it if it's not working" principle; broken middleboxes are screwing with your client, so if these middleboxes were never fixed, we could never use IPv6. Instead we have shitty workarounds. Sometimes that's just the best option available.