ECMP/multipath support

[Joakim Tjernlund]

>
> Ondrej Zajicek <santiago at crfreenet.org> wrote on 2010/12/17 00:50:41:
> >
> > On Thu, Dec 16, 2010 at 08:41:24PM +0100, Joakim Tjernlund wrote:
> > > This will find any ptp link that matches and several of them will match.
> >
> > Not really. For unnumbered ptp links (where sharing of IP addresses
> > between several interfaces is common), the match is based on interface
> > ID, which is unique. For numbered ptp links, the match is based on
> > IP address, but in that case sharing IP addresses (and therefore
> > network prefixes) is pathological and would cause other problems.
>
> I don't remember all the details anymore but sharing IP address for numbered
> ptp I/Fs is not pathological. It should just work. Also any combination of
> numbered vs. unnumbered, IP address or no IP address(even pppd supports no IP address
> on ptp links).
> If you do it my way you can combine ptp links any way you want and it will scale better too.
>

Something like this. It is not tested at all and and very simple.