overload using loopback interface

[petercinvest]

I have one router, E2/0.11 to E2/0.13 is configured with ip nat inside, E2/0.90 and E3/0.90 is configured with ip nat outside, now i'm going to do PAT on this device.

should i use ip nat inside source list 1 interface E2/0.90 overload and p nat inside source list 1 interface E3/0.90 overload or should i use lo0 interface? why?

[Mark Malone]

Any source addresses  packets that match acl 1 will be converted Lo0 IP address leaving the router is that what you want ? as that's what will happen using the loopback as the overload , is your loopback configured as a public ip ? if not use the E interfaces

see this doc for examples of how to use overload in diff scenarios

http://myhowtosandprojects.blogspot.com/2015/06/cisco-nat-overload-on-loopback-exit.html