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Cisco 2901 Failover with NAT routes and dual ISPs

I currently have a 2901 in place to do all the routing on my network. It's currently configured to do all static NAT routes to the main interface of GigabitEthernet0/1. This as you can imagine, works with no issues.

The issue comes in when we try to intergrate a EHWIC 1GE-SFP-CU card into the mix. This simply just adds another eth port to the router. It is configured as GigabitEthernet0/0/0.

I need to do failover between 0/0 and 0/0/0 so that if the main ISP goes down for some reason, it picks up on the LTE backup and keeps on trucking.

I have not been able to do this, at all. The routes are "hard coded" to one of 0/0's two IP address, so they look like: ip nat inside source static tcp 25 25 extendable. This does not play well with an kind of failover situation.

So to sumerize:

Cisco 2901 with card EHWIC 1GE-SFP-CU added on,

Primary ISP is GigabitEthernet0/0 - has 2 static IPs

Card is GigabitEthernet0/0/0 - has 1 static IP

There are 3 vlans in place as well, 10,20 and 30.

Usual aray of ports to forward on the network.

I hope this makes sense...

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