overload using loopback interface

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12-20-2016 02:52 AM - edited 03-08-2019 08:38 AM
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?
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12-20-2016 03:02 AM
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
