I have inet6 problems even with a very simple config:pass stateful out family inet6 from $if_ext pass stateful in \ family inet6 to $if_extYou also need to allow ipv6-icmp from/to fe80::/10 and ff00::/10$link6 = { fe80::/10, ff00::/10 } and let the traffic pass: pass stateful out family inet6 proto ipv6-icmp from $link6 pass stateful in family inet6 proto ipv6-icmp to $link6
Seems to have fixed the sporadic inet6 problems. Darrel