Packet reverse route

[Scott Schilling]

I have a network that a packet reaches put has a diffrent return route to the source (default route). the packet fails. the source has a route to the destionation and the destionation network has a default route back to the source but thy are over diffrent paths. why wont this work ? any ideas?

[sundar.palaniappan]

Hi,

It should work if every device on the return path knows how to get to the source address. This type of behavior is called 'assymetric' routing. Though this mayn't be an optimal routing setup but it should defintely work provided, every device in the return path has a route back to the source. Use traceroute to identify the hop(s) missing the route.

HTH

Sundar

[Scott Schilling]

Thanks for your response the path to the network is a mpls network and the path back is a vpn tunnel. I am thinking that the asa5510 is maybe using unicast revers path forwarding by defualt? it would see a internal route to the destination out one interface and returning on another.

Scott