[Bug 237748] net/dhcp6 fails to configure prefix on loopback device

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237748

            Bug ID: 237748
           Summary: net/dhcp6 fails to configure prefix on loopback device
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: hrs at FreeBSD.org
          Reporter: driesm.michiels at gmail.com
             Flags: maintainer-feedback?(hrs at FreeBSD.org)
          Assignee: hrs at FreeBSD.org

Hi,

I'm trying to assign a 64 prefix on a cloned loopback device (lo1). This prefix
will be used by IPFW in NPTv6 to make my jails ipv6 accessible.

My dhcp6c.conf file:

interface em0 {
        send ia-na 0;
        send ia-pd 0;
        send rapid-commit;
};

id-assoc na { };

id-assoc pd {
        prefix ::/56 infinity;
        prefix-interface igb0 {
                sla-id 0;
                sla-len 8;
        };
        prefix-interface lo1 {
                sla-id 1;
                sla-len 8;
        };
};

Debug output when running in foreground mode with -D flag:
May  4 16:24:45 vados dries[70999]: /usr/local/etc/rc.d/dhcp6c: WARNING: failed
to start dhcp6c
May  4 16:25:14 vados dhcp6c[91112]: link layer address is too short (lo1)
May  4 16:25:14 vados dhcp6c[91112]: failed to get default IF ID for lo1
May  4 16:25:14 vados dhcp6c[91112]: failed to parse configuration file

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