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NAT

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Www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_7-3/ipj_7-3.pdf. NAT-Tester Technische Universität München. Network address translation. Originally used to simply map each address of one address space to a corresponding address in another space, most often today, NAT is used in conjunction with network masquerading (or IP masquerading) which is a technique that hides an entire IP address space, usually consisting of private network IP addresses (RFC 1918), behind a single IP address in another, usually public address space.

Network address translation

This mechanism is implemented in a routing device that uses stateful translation tables to map the "hidden" addresses into a single IP address and readdresses the outgoing Internet Protocol packets on exit so they appear to originate from the routing device. In the reverse communications path, responses are mapped back to the originating IP addresses using the rules ("state") stored in the translation tables. NAT Network Address Translation / About SIP / SIP Firewall and NAT Traversal.