NAPT, or Network Address Port Translation, is a method by which many network addresses and their TCP/UDP (Transmission Control Protocol/User Datagram Protocol) ports are translated into a single network address and its TCP/UDP ports. NAPT allows mapping of tuples of the type (local IP addresses, local TU port number) to tuples of the type (registered IP address, assigned TU port number). NAPT is defined in the RFC3022 section 2.2.
See also NAT.
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