NAT and failover wan links

spork · Guest

Hi all,

What's the secret sauce to get NAT working in a failover situation?

I have a router with one internal interface and two WAN connections.
I'm using OSPF to provide failover. I only want traffic to traverse
the secondary (slower) WAN connection when the primary link is down.

I'm not seeing an obvious way to do this. I thought I had found a
hack by putting "ip nat outside" on the loopback interface (which is
always reachable from outside as long as either WAN connection is up),
but that did not seem to work. No NAT translations ever showed up
when that config was in place.

Any simple options for this config? It would seem like a pretty
common config, especially now that cisco is entering the low end with
the 800 series where a business could have both DSL and cable...

Thanks,

Charles