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A machine that has interfaces (adapters or serial lines) to more than one network may operate as a ``gateway'' between networks by forwarding and redirecting packets from one network to another.
When you configure a second adapter under TCP/IP, you are prompted to turn on this gateway behavior or leave your machine in the default, non-gateway mode. If you do not make your machine into a gateway, it will continue to receive packets on each network at the specified IP addresses, but will not forward packets between networks.
See also: