Messages

Have you ran a test from www.test-ipv6.com to see if IPv6 is partially functional? If some of the tests with hard coded IPv6 address pass and the ones with DNS lookup fail then it could be a sign that you need to configure an IPv6 DNS server.

I've noticed the same behavior, especially on the WAN interface. Any changes made to that interface loses the IPv6 address obtained from the ISP and won't acquire until about a day later. I do however get an fe80::/64 address as an address without any delay. My service provider is Comcast.

Static address on my LAN side works fine including SLAAC. Though the router that my computers pick is the fe80::/64 address and not what I configured for the network, a static address in the fd00::/8 network.

A while ago, maybe an early build of 17.7, my DHCP6 dynamic gateway actually had a global address from the 2000::/56 network.

Originally, I thought maybe the ISP changed something with how IPv6 networks are handled, but this does not seem to be the case.
Unfortunately, IPv6 documentation is sparse of anything regarding configuration, and I doubt the ISP will have decent support.