THE NETWORK ADDRESS TRANSLATION PROTOCOL
The Network Address Translation (NAT) allows an organization to use private, nonregistered IP addresses (nonglobally routable addresses) within its own routing domain. If traffic is to be sent out of this domain, NAT translates these addresses to globally routable addresses. The reverse process occurs at the router for traffic received by the domain. NAT thus allows an organization to use its own private addresses. It also supports a process called the TCP load distribution feature that allows the mapping of a single global address to multiple nonglobal addresses. This feature is used to conserve addresses, and is explained shortly. NAT is described in RFC 1631, and examples used in this discussion are ...
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