11-09-2010 08:47 AM
Currently going through a ISP change. We have the luxury of having both WAN links up so we don't have to do a hot cut. I'm trying to figure out how this can be achieved. The set up needs to route requests back out the interface on which they were received. Example web requests comes in on ISP A's link, it needs to respond back out ISP A's link. The one idea that comes to mind is separate Virtual routers for each ISP and then using NAT to change the source IP for requests so they come back to the interface they originated from. This is the only way I see it working but wanted to get some other ideas if any exist.
11-12-2010 04:58 PM
Hi Marcus,
That approach will work. Another approach is to use Policy Based Forwarding and NAT together to influence the in and outbound traffic to each ISP.
This document might help with some modification: https://live.paloaltonetworks.com/docs/DOC-1357
Cheers,
Kelly
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