Single carrier multi-circuit asynchronous routing issue

Wed Jan 7 21:00:28 UTC 2009

On 7 jan 2009, at 21.05, Niels Bakker wrote:

> * aaron.millisor at 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.
>

Strict-mode uRPF will couse this, I am sure sprint support can help  
you with it..

------------------------------
Anders Lindbäck
anders.lindback at dnz.se