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Computing (FOLDOC) dictionary
Port Address Translation
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networking (PAT) A function provided by some routers which
allows hosts on a LAN to communicate with the rest of a
network (such as the Internet) without revealing their own
private IP address. All outbound packets have their IP
address translated to the routers external IP address.
Replies come back to the router which then translates them
back into the private IP address of the original host for
final delivery.