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Redirected from: address resolution protocol

Definition: ARP


(Address Resolution Protocol) A TCP/IP protocol used to obtain a node's physical address in the traditional IP addressing system (see IPv4). A client station broadcasts an ARP request onto the network with the IP address of the target node it wishes to communicate with, and the node with that IP address responds by sending back its physical MAC address so that packets can be transmitted. ARP returns the layer 2 address for a layer 3 address. See NDP, ARP cache, ARP cache poisoning, RARP and TCP/IP abc's.




ARP'ing
The IP protocol broadcasts the IP address of the destination station onto the network, and the node with that address responds.