Inverse Address Resolution ProtocolFrame Relay stations route frames 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 Ethernet LAN, however RARP answers the question "What is my IP Address?" whereas InARP answers the question "What is your protocol address?". See RFC 2390.
Last updated: 2000-01-15