pfSense

2.7.0

WAN IPv6 address set statically. 2001:db8:5000:5::1/64. Gateway is fe80:: with an interface route %vtnet0

There is also a virtual IPv6 address defined and bound to WAN. It is 2001:db8:1:2::1/128.

The instance announces 2001:db8:1::/48 via BGP.

RFC2136 client is set up to monitor WAN interface, update Ipv4 and Ipv4 addresses. "Use public IP is checked". "Update Source" and "Update Source Family" are default.

Expected Behavior:

It should update the AAAA record with the Ipv6 address that is configured in /interfaces.php?if=wan

Actual Behavior:

It updates the record with the virtual IP address.

Possible clue:

I have replicated this on several instances until I found one that is NOT effected. The difference is that the instance that works as expected has the IPv6 gateway clearly defined as ::1 of its /64 whereas the instances that misbehave have the IPv6 default gateway set as an interface route to fe80::