The Internet faces the challenges of conserving IP address space while continuing to provide scalability in routing. Network Address Translation (NAT) helps address these challenges by allowing the conservation of registered IP addresses within private networks and simplifying IP addressing management tasks through a form of transparent routing.

NAT enables you to translate IP addresses between two address realms (for example, between an intranet network that uses private, not publicly routable addresses and the Internet, or between two overlapping, private networks). When incoming traffic is received, the IP addresses are translated back for delivery within the private network.

Using NAT at the edge of your intranet provides the following advantages: