Understanding Network Address Translation (NAT) and Port Address Translation (PAT). All homes and business networks use private IP addresses all home and business routers have NAT built-in. Tables inside the software of routers maintain IP traffic internally and externally as it transverse the router. NAT or PAT tables allow the use of one usable IP address on your router to be "used by all hosts" inside your LAN. NAT saved IPv4 from quick extinction and was developed in 1990. Not all applications can use NAT such as VoIP so various type fixes have been designed. NAT transversal or Application Level Gateways can be used by some applications. PAT is very popular and uses port numbers to allow and NAT functions.
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