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In order to configure traditional NAT, you need to make at least one interface on a router (NAT outside) and another interface on the router (NAT inside) and a set of rules for translating the IP addresses in the packet headers (and payloads if desired) need to be configured. In order to configure Nat Virtual Interface (NVI), you need at least one interface configured with NAT enable along with the same set of rules as mentioned above.
For more information, refer to Cisco IOS IP Addressing Services Configuration Guideor Configuring the NAT Virtual Interface.