[WireGuard] Using wireguard link as a proxy?

[Bruno Wolff III]

On Sat, Jul 23, 2016 at 11:36:37 -0500,
  Bruno Wolff III <bruno at wolff.to> wrote:
>The explanations for marking and policy routing aren't explicit about 
>how you need to handle the source address issue and why it happens, 
>though there are lots of mentions that there are problems related to 
>the source address.

You also need to turn off rp_filter on interfaces because packets coming 
from the tunnel can look like they should have come from the normal 
gateway and will get dropped locally.