Address Resolution Protocol

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Related to Address Resolution Protocol: Reverse Address Resolution Protocol

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.
References in periodicals archive ?
One was from the machine that was supposed to be answering the address resolution protocol packet; the other was from the culprit, the machine that had been answering all calls.