arpd replies to any ARP request for an IP address matching the specified destination net with the hardware MAC address of the specified interface, but only after determining if another host already claims it. Any IP address claimed by arpd is eventually forgotten after a period of inactivity or after a hard timeout, and is relinquished if the real owner shows up. This enables a single host to claim all unassigned addresses on a LAN for network monitoring or simulation.
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