pfSense

I would like to be able to set a static LLAs (such as fe80::10:1/64, fe80::20:1/64 etc) on WAN-tracked interfaces.
Reason: Each interface receives a SLAAC-LLA which is not ideal to troubleshoot when looking at traceroutes. Typically routers use static LLAs on their interfaces for network management.

Tried alternatives:
-Added as a virtual IP (IP alias). RA does not advertise it.
-Added via a shellcmd.
ifconfig igc0.10 inet6 fe80::10:1/64 alias
RA does not advertise it.

It might be possible with CARP VIP, but that adds a lot of unnecessary complications that I do not want.

A shellcmd to inject AdvRASrcAddress into the radvd configuration may also work, but it seems too fragile and prone to later break.

Posted on Netgate forum:
https://forum.netgate.com/topic/200815/static-lla-gateway-and-ras-on-tracked-interfaces
Suggested to post a feature request.