Adding an IPv6 GUA to loopback

[Greelan]

I've been investigating adding an IPv6 global unicast address to my OPNsense box's loopback.

I've achieved it by creating a new loopback device, assigning a new interface to that device, and then assigning a static IPv6 address to that interface using my prefix and an unused prefix ID. That works fine.

But that results in a new loopback interface being created (lo1, separate to the existing lo0), and also means that if my prefix changes, I need to manually update the static IP. That's not the end of the world, but:

• is there a way to add the GUA to the existing lo0 instead - I couldn't see a way in the web interface
• is it possible to generate the address by SLAAC instead of creating a static IP - I tried to use Track Interface and configure the interface to use SLAAC, but that seemed to kill dhcp6c

In the end, it probably doesn't really matter if I can't change my current approach, but I was curious if I could streamline it.

Thanks