ipv6 wan stops working after a while

[Voodoo]

I have a ipv6 wan dhcp setup which works fine except it stops working every 3-6 weeks.

The system log gets spammed with:
in6_ifadd: xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx is already configured

I have to interfaces -> overview -> wan -> dhcp reload, to make it work again.

The ipv6 i get from my isp has a static prefix and i think this messes up the dhcp lease.

Opnsense should ignore if its the same ip and just go with it, right now its killing the interface ?!

[jeremygaither]

I've seen mine lose their IPv6 address and delegated prefix, but usually can't get it back without turning everything off, and then waiting a while before turning it back on.


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[mahescho]

Perhaps this may help:

https://github.com/opnsense/core/issues/4338

It solved my problem.

[Voodoo]

Thanks for the update, I will restart the daemon next time the problem occurs to verify if its the same problem and apply the patch.

[gogolathome]

Restarting radvd didn't work for me. You can also try to restart DHCPv6 service, but this wasn't a very consistent solution for me. One time it did work and another time it didn't.
Going back to 20.1 made my system rock solid again.
As I understand it it is all still under investigation.

[agh1701]

Is this fixed in 21.7.5?  Don't see any menchion of RADVD in the change log.

[gpb]

Apparently not fixed yet, and if you applied the patch for rtadvd (which is a direct replacement for radvd and native to freebsd) you'll need to reapply it after upgrade.

opnsense-patch 9a4a908 (per link above in this thread)

Edit: modified patch version (per below)

[agh1701]

I believe it is superseded by opnsense-patch 9a4a908

see https://github.com/opnsense/core/pull/4461

[gpb]

I believe it is superseded by opnsense-patch 9a4a908

see https://github.com/opnsense/core/pull/4461

Thanks!