Comcast IPv6 "sendto error: 65"

[mircolino]

Just migrated from pfsense where the exact same configuration used to work fine.

The WAN DHCPv6c is sending a hint and requesting a 60 bit delegation from Comcast
Everything seem to work well:
  - the WAN interface gets a IPv6 address
  - all other tracking interfaces (LAN, DMZ, IOT, GUEST) get a proper IPv6 address within the delegated IPv6 prefix.

Yet the monitored IPv6 local-link gateway is shown as offline with a 100% packet loss and in the log file I see a stream of "sendto error: 65".

The exact same config works well in pfsense. Is there anything different I need to do in OPNsense?

PS: it may have been just a fluke, but at one point I accidentally disabled the WAN IPv4 DHCPc so that the WAN would not get a IPv4 address/gateway and all of a sudden IPv6 started working. Not sure if this means anything.

[marjohn56]

I'm seeing the same thing. Somewhere along the way a regression has crept in and caused this issue, it's been reported on Github. In the meantime use a GUA as your monitor target such as one of the ipv6 dns servers.