Port address translation
Port Address Translation (PAT) is a feature of a NAT device that translates TCP or UDP connections made to a host and port on an outside network to a host and port on an inside network.
PAT allows services on multiple inside hosts to appear as services on a single outside host ip address.
In a typical firewall configuration, the outside network is the Internet and the inside network is the LAN.
In a typical DMZ configuration, the outside network is the Internet and the inside network is the DMZ.
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