Feature request: static routes to not directly connected gateways

[Alexander Demenshin]

Hi,

It would be nice to be able to use "indirect" gateways, i.e. which are 
routed via interface but are not part of interface networks, like this:

protocol static {
   route 10.1.1.0/24 via "eth0";
   route 10.2.1.0/24 via 10.1.1.1;
}

Linux supports this, so it would be really useful and opens interesting 
opportunities, like automatically adding routes once specified gateway 
becomes reachable after adding an interface-bound route (either outside 
or inside of Bird).

One possible application (from my actual configuration) is routing of 
specific networks through VPN gateway - the gateway itself is in /30 
transfer network (and this could not be changed easily) so I could not 
make it reachable directly on more than one Bird router simultaneously.

Please consider this for next release :)

Thank you!

-- 
With best regards,
Alexander.