Address Resolution Protocol

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Address Resolution Protocol

(networking, protocol)
(ARP) A method for finding a host's Ethernet address from its Internet address. The sender broadcasts an ARP packet containing the Internet address of another host and waits for it (or some other host) to send back its Ethernet address. Each host maintains a cache of address translations to reduce delay and loading. ARP allows the Internet address to be independent of the Ethernet address but it only works if all hosts support it.

ARP is defined in RFC 826.

The alternative for hosts that do not do ARP is constant mapping.

See also proxy ARP, reverse ARP.
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ARP

(Address Resolution Protocol) A TCP/IP protocol used to obtain a node's physical address. 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 address responds by sending back its physical address so that packets can be transmitted. ARP returns the layer 2 address for a layer 3 address. See 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.
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