OPNsense Forum

English Forums => High availability => Topic started by: random1104 on June 15, 2023, 06:01:42 am

Title: Cluster & IPv6 Router advertisement
Post by: random1104 on June 15, 2023, 06:01:42 am

Hello!,

I found this topic https://forum.opnsense.org/index.php?topic=25158.15

which seems to imply that there's already a recipe, but I fail to find the expected configuration. Do we use CARP with for IPv6 subnets + cluster?, or CARP is not needed and everything should work automagically?

Title: Re: Cluster & IPv6 Router advertisement
Post by: Patrick M. Hausen on June 15, 2023, 07:54:59 am

You use CARP and a link-local address as the CARP address.

Title: Re: Cluster & IPv6 Router advertisement
Post by: franco on June 15, 2023, 08:38:15 am

And need to set it as the Router Advertisement "Source Address" option on both machines.

Since the prefix deprecation is turned off in CARP mode your prefix should not be changing very often. If it does you may run into intermittent connectivity issues on each prefix change.


Cheers,
Franco

Title: Re: Cluster & IPv6 Router advertisement
Post by: random1104 on June 26, 2023, 07:15:38 pm

Quote from: pmhausen on June 15, 2023, 07:54:59 am

You use CARP and a link-local address as the CARP address.

Should I use a different link-local address per VLAN/Interface, or can I get away with using the same one (can't recall if there's a recommendation for that)

Title: Re: Cluster & IPv6 Router advertisement
Post by: Patrick M. Hausen on June 26, 2023, 08:33:28 pm

You can use the same for every network but in case of VLANs I use fe80::<VLAN-ID>