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General Discussion / Re: Confused about IPv6
« on: May 17, 2024, 04:07:52 pm »Either fe80::1 for all. Link local addresses are local to a single link (surprise!) so using the same address on all interfaces is fine.
Ah, cool, I didn't know that multiple Interfaces could all be identified as "fe80::1" and the System would still work ...
But where are you suggesting to put this for the CARP Interface ? On the OPNSense CARP Tutorial it says to use the CARP Address as "Source Adress" in the Router Advertisement Section: https://docs.opnsense.org/manual/how-tos/carp.html#setup-router-advertisments
So far I have it set to "Automatic" and no Route is Advertised (I think it's more reliable like this than to advertise the route for the Subnet etc).
Usually loopback addresses are addressed by "<IPv6 address>%<interface name>", so that it works with duplicate addresses and prefixes.
By default, if you manage addresses by SLAAC, then the source address of the router advertisement is automatically the default gateway. So you should do that as the howto specifies.