Network and Address Terms

The NAT implementation defines an address realm as either inside or outside, with the router that is running NAT acting as the defining boundary between the two realms.

From a NAT perspective, an inside network is the local portion of a network that uses private, not publicly routable IP addresses that you want to translate. An outside network is the public portion of a network that uses legitimate, publicly routable IP addresses to which you want private hosts to connect.

The addresses that are translated by NAT between address realms are labeled as inside or outside, and as local or global. When reading the terms in the following sections, keep the following definitions in mind:

• The terms inside and outside refer to the host that the address is associated with.
• The terms local and global refer to the network on which the address appears.

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