Proxy ARP

The technique in which one host, usually a router, answers Address Resolution Protocol (ARP) requests intended for another machine.

By "faking" its identity, the router accepts responsibility for routing packets to the "real" destination. Proxy ARP allows a site to use a single IP address with two physical networks.

Subnetting would normally be a better solution.

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provably difficult
provably unsolvable
provocative maintenance
Address Resolution Protocol
proxy ARP
proxy gateway
Proxy Server
proxy server