FreeBSD if_wg POINTTOPOINT and MULTICAST behaviour

Toke Høiland-Jørgensen toke at
Thu Apr 15 17:53:14 UTC 2021

"Jason A. Donenfeld" <Jason at> writes:

> Hi Stefan,
> Sounds like Toke has come up with the optimal solution, so I think
> I'll drop the "link1" patch/hack.
> One thing I was wondering though, mostly for my own curiosity, is what
> config you're using that shows the problem, and how does the problem
> manifest?
> I just put this in bird.conf:
> router id;
> protocol babel {
>        interface "wg0" {
>                type wired;
>                port 1234;
>        };
> };
> And then I ran:
> # pkg install bird2
> # bird -d -c bird.conf
> And I didn't see any troubling error messages. But maybe it's more
> subtle than that?

I think it would just silently ignore the interface; does it say
anything about running on it? You could also see if there's any traffic,
there should be UDP packets with dest port 6696 appearing if it does


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