WAN_DHCP6 Gateway Unknown After Updating to 2.5.0

[mircolino]

Running 2.4.5-p1 without issues:

Upgraded to 2.5.0 with the exact same configuration and IPv6 gateway is no longer working:

WAN_DHCP6:  ~
RTT:        pending
RTTsd:      pending
Loss:       pending
Status:     unknown

Reverted to 2.4.5-p1 and everything is back to normal.
Any idea what might be causing this?

[Traveller]

@mircolino This sounds like this error: https://forum.netgate.com/post/965293

You may need to manually set the upstream IPv6 gateway until they get the bug fixed.

The good news is that they have reproduced this, so they be more efficiently address the issue.

[mircolino]

@traveller

Thank you. Don't know how I missed that.

Indeed, forcing a monitoring IPv6 address fixes the issue.