We have a router in one of our offices that has a T1 as it's primary Internet connection and is doing PAT using overloading (using the serial0/1/0 interface address).
A new fractional T1 was installed in another serial (serial0/2/0 interface for their backup internet connection and I'm having a problem with NAT when users go out this interface.
My configuration looks like this.
access-list 10 permit 192.168.132.0 0.0.0.255
access-list 20 permit 192.168.132.0 0.0.0.255
ip nat inside source list 10 interface s0/1/0 overload
ip nat inside source list 20 interface s0/2/0 overload
desc main internet link
ip nat outside
desc backup internet link
ip nat inside
ip route 0.0.0.0 0.0.0.0 s0/1/0
ip route 0.0.0.0 0.0.0.0 s0/2/0 10
I tried using ACL 10 for both overload statements but it did not work so I made 2 ACLS that are identical so I can have both overload statements in the config.
I have a feeling that when the router is trying to do nat, it is still using the first overload statement (for s0/1/0).
Could someone please help me with this config? Do I need a route map or something? This office does not care about their source IP address on the Internet since no external DNS is considered so PAT is fine.
Thanks for the help.