[Babel-users] battling with babel and route changes

[Juliusz Chroboczek]

> I believe this is indeed working around an old kernel bug.  We needed to
> make this work with some old 2.4.x kernel.  A quick test on 2.6.32
> suggests that adding a two routes with the same metric and different
> gateways works just fine now.

I may be wrong, but I believe that this is due to IP_ROUTE_MULTIPATH
being enabled in your kernel, and has nothing to do with the kernel's
vintage.

Dave, please note that the window when there's no route is very short --
it lasts just a few microseconds --, so you'll typically lose just
between 0 and 1 packets on a route change.  I agree that it should be
fixed, and using Linux' ability to do multipath is a good workaround, as
long as it doesn't break babeld on non-multipath kernels.

-- Juliusz