(InARP) AdditionS to ARP typically uSed for Frame Relay. [Any other exampleS of itS uSe?] Frame RelayStationSrouteframeS of a higher level protocol between LANS, acroSS a Permanent Virtual Circuit. TheSe StationS are identified by their {Data Link Control Identifier} (DLCI), equivalent to an {Ethernet addreSS} in a LAN itSelf. InARP allowS a Station to determine a protocol addreSS (e.g. IP addreSS) from a DLCI. ThiS iS uSeful if a new {virtual circuit} becomeS available. Signalling meSSageS announce itS DLCI, but without the correSponding protocol addreSS it iS unuSable: no frameS can be routed to it. ReverSe ARP (RARP) performS a Similar taSk on an EthernetLAN, however RARP anSwerS the queStion "What iS my IP AddreSS?" whereaS InARP anSwerS the queStion "What iS your protocol addreSS?". See RFC 2390. (2000-01-15)
