How to unset "gw" attribute when exporting

[Yousong Zhou]

On Wed, 4 Dec 2019 at 00:16, Alexander Zubkov <green at qrator.net> wrote:
>
> Hi,
>
> You do not need to set gw to zeroes. You can set ifname for the route
> and it makes route via an interface. Please look at this tread:
> https://bird.network.cz/pipermail/bird-users/2018-November/012836.html
>

Thanks, this is it!  It's also very informative to know that there are
also efforts in the linux kernel to have separate nexthops objects
with associated netdevice.

Regards,
                yousong

> On Tue, Dec 3, 2019 at 1:28 PM Yousong Zhou <yszhou4tech at gmail.com> wrote:
> >
> > Hi list,
> >
> > I just tried running BGP over WireGuard link and noticed that routes
> > were exported to kernel with "via x.x.x.x" attributes.  It's a L3
> > point-to-point link.  While routing works with or without this
> > attribute, I am wondering if there is a way to eliminate it.
> >
> >   10.168.222.0/24 via 169.254.169.1 dev wg1 proto bird metric 32
> >
> > vs.
> >
> >   10.168.222.0/24 wg1 scope link
> >
> > I tried setting "gw = 0.0.0.0" using an export filter, but bird will
> > complain "Invalid gw address" because 0.0.0.0 is considered as
> > IADDR_INVALID.
> >
> > I am relatively new with routing daemons and protocols at the moment,
> > so any comments are welcome.  Thanks in advance.
> >
> > Regards,
> >                 yousong