Network Address Port Translation (NAPT)

Network Address Port Translation (NAPT), as specified in RFC 3022, 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. Together with Basic Network Address Translation (see NAT), these two operations, referred to as traditional NAT, provide a mechanism to connect a realm with private addresses to an external realm with globally unique registered addresses.

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