[arch-general] systemd-networkd and netctl with multiple interfaces

[Andrew Von Stein]

Expanding on the ip route command, you can you see what interface is used
to reach the Internet by looking at the default route. The entry that has
the destination as 0.0.0.0 and the subnet mask as 0.0.0.0 is the default
route. If your LAN is shown above your wifi interface I'm going to assume
that the default route is set to the LAN, but this leaves you with
definitive proof that it's working how you want it. Also, you'll want to
type "ip route -n" so you don't resolve hostnames.

Also, if your wireless and LAN networks use a different gateway, you can
run a traceroute to an outside address to see what path the packets are
taking. Since it only shows the next hop IP address it doesn't work if your
networks use the same IP addressing scheme.

Regards,
Andrew

On Wed, Nov 11, 2015, 5:22 AM Bennett Piater <bennett at piater.name> wrote:

> > I don't use netctl, but you can usually see what default route it uses
> with
> >
> >       ip route
>
> Thanks for that, I didn't know that command.
> The LAN is shown above WIFI, which (I assume) means that it takes
> precedence.
>
> >
> > I have made the experience that newly configured interfaces "steal" the
> > default route (although this can usually be configured - again, I don't
> > use netctl).
> >
> > I can imagine the default route passing through the WiFi interface in
> > your scenario.
>
> If I plug in LAN while having an active WIFI connection, it seems to
> steal the route. I checked it by monitoring steam download speeds.
>
> Thanks!
>
> Cheers,
> Bennett
>
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