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Re: Single carrier multi-circuit asynchronous routing issue
From: Niels Bakker <niels=nanog () bakker net>
Date: Wed, 7 Jan 2009 21:05:56 +0100

* aaron.millisor () bright net (Aaron Millisor) [Wed 07 Jan 2009, 20:53 CET]:
If I were to prepend the network to come in on 'sprint 1', but have a route to 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 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.

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