Important notices

Before you add a new report, we ask you kindly to acknowledge the following:

• I have read the contributing guide lines at https://github.com/opnsense/core/blob/master/CONTRIBUTING.md
• I am convinced that my issue is new after having checked both open and closed issues at https://github.com/opnsense/core/issues?q=is%3Aissue

Is your feature request related to a problem? Please describe.

On my server, there are multiple interfaces using fe80:: prefixes (e.g. podman).
I tried to solve that issue by setting a static IPv6 configuration with my own private ULA (fdb0:[...]).
However, I noticed that now I simply get an additional IPv6 address:

    inet6 fdb0:[...]/64 scope global dynamic noprefixroute 
       valid_lft 86355sec preferred_lft 14355sec
    inet6 fe80::[...]/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

Describe the solution you like

Is there a way to replace the fe80:: address with my own ULA?
Or would it be possible to disable the fe80:: address and set the fdb0:[...] as default gateway?

Describe alternatives you considered

Additional context