ATT Fiber: IPV6 in, but not out.

[lrosenman]

I have allow IPv6 any to any set, and I can get a session established from outside to inside, but outbound seems to be blocked <SOMEWHERE>

How can I diagnose this?

this is on ATT Fiber, and it used to work.

21.7.6

[lrosenman]

ATT appears to have broken <something>.   I've turned off IPv6 for now.  I'll check it again in a few weeks.