[Bug 268973] can't add a different second segment other than 0 when using the fe80::/10 local link range

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268973

            Bug ID: 268973
           Summary: can't add a different second segment other than 0 when
                    using the fe80::/10 local link range
           Product: Base System
           Version: 13.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: conf
          Assignee: bugs@FreeBSD.org
          Reporter: nbari@tequila.io

I can't set the following address: fe80:80::1/64 using the command:

ifconfig wg.p-test inet6 fe80:80::1

It will create:

inet6 fe80::1%wg.p-test prefixlen 64 scopeid 0x7

If I try: fe80:80:80::1 it will set inet6 fe80:0:80::1

The second segment is always set to 0 only when using the fe80 prefix.

any idea why this happens? it is a bug or maybe a filter?

I am trying to add the IP to a wiregurd VPN interface.

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