[c-nsp] Simple NAT based IOS failover between providers

[Rodney Dunn]

> 
> >I'm working on the timeout problem with the probe. It looks broke
> >to me as it doesn't honor the consecutive retries I configured and
> >takes the route down immediately. Just a gotha with the configuration
> >I gave for now.
> 
> Thank you! We are going to try this today in the lab with a NAT config and 
> a floating static for the backup and a default to the T1 interface to see 
> if the NAT changes from the primary to the backup as expected.

The key is detecting the path failure to remove the route.
If it's a serial in the lab it will come down if you pull the
cable or is the keepalives timeout.

Think of it this way: you route first and then nat going in to out.

So if you move the routing your NAT will change based on the match
in the route-map.

Let us know how it goes.

I haven't had time to figure out the NVI stuff as it may change
that concept just a little about the in/out route first stuff.


> 
> -Robert
> 
> 
> 
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