Lets say we have two WAN links from two different ISP's. ISP 1 and ISP 2
interface FastEthernet0
description ISP 1
ip nat outside
interface FastEthernet1
description ISP 2
ip nat outside
interface Vlan1
ip nat inside
ip nat inside source route-map ISP1 interface FastEthernet0 overload
ip
interface FastEthernet0
description ISP 1
ip nat outside
interface FastEthernet1
description ISP 2
ip nat outside
interface Vlan1
ip nat inside
ip nat inside source route-map ISP1 interface FastEthernet0 overload
ip