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A router responds for an ARP reply with its own MAC address to a host. This is called:
Router ARP Response (RAR)
Proxy ARP
Unknown ARP
Forwarding ARP Proxy (FAP)
With Proxy ARP a router can answer to an ARP request with its own MAC address. Proxy ARP can help machines on a subnet reach remote subnets without the need to configure routing or a default gateway.
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