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Definition - What does Network-to-Network Interface (NNI) mean? A network-to-network interface (NNI) is a physical interface that connects two or more networks and defines inter signaling and management processes. It enables the linking of networks using signaling, Internet Protocol (IP) or Asynchronous Transfer Mode (ATM) networks. A network-to-network interface is also known as a network node interface (NNI).
The NAT Virtual Interface (NVI) feature removes the requirement to configure an interface as either NAT inside or NAT outside. An interface can be configured to use or not use NAT. The NVI feature allows NAT traffic flows on the virtual interface, eliminating the need to specify inside and outside domains. When a domain is specified, the translation rules are applied either before or after the route decisions depending on the traffic flow from inside to outside or outside to inside.