Re: Single carrier multi-circuit asynchronous routing issue

[Niels Bakker <niels=nanog () bakker net>]

* aaron.millisor () bright net (Aaron Millisor) [Wed 07 Jan 2009, 20:53 CET]:
[..]
> If I were to prepend the network 1.1.1.0 to come in on 'sprint 1', but 
> have a route to 2.2.2.0 via 'sprint 2' so that traffic comes in on one 
> circuit but returns on the other, routing is broken. If I change my 
> route so that packets directed to 2.2.2.0 return on the same circuit 
> that the traffic is received on, everything works fine.

You might be running into uRPF (unicast reverse path forward 
verification).


        -- Niels.