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