NAT stands for Network Address Translation/Network Address Translator. Each computer connected to the Internet needs to have a unique IP address. To use the global IP addresses more efficiently, computers belonging to a business can have “local” addresses. NAT would then allow connecting multiple “local” computers to the Internet using one IP address. Each NAT has a ‘table’ of local IP addresses and globally unique addresses by which the NAT box can translate the local IP addresses to global address and vice versa.
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