Two enterprise networks must be connected together Both networks are using the same private IP addresses. The client requests from both sides should be translated using hide NAT (dynamic NAT) with…

A single Cisco IOS router is fully capable of performing dynamic NAT in both directions at the same time by combining inside source and outside source configurations, making a second router unnecessary.

Applying 'ip nat inside' and 'ip nat outside' to interfaces is a prerequisite for NAT operation but does not resolve the overlapping address problem without also defining separate pools for each translation direction.

The overload keyword enabling PAT is not enabled by default and must be explicitly appended to the 'ip nat inside source' or 'ip nat outside source' command.

When two networks share overlapping private address space and require bidirectional NAT on a single router, two separate NAT pools must be defined - one used with 'ip nat inside source' for translating outbound inside traffic and a different one used with 'ip nat outside source' for translating inbound outside traffic - preventing address collisions and allowing the router to maintain correct translation state in both directions simultaneously.

NAT Virtual Interface removes the inside/outside interface distinction but does not address the core requirement of maintaining two separate NAT pools for translating overlapping addresses in both directions.