< networking , protocol > (InARP) Additions to ARP typically used for Frame Relay . [Any other examples of its use?]
Frame 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 .
(2000-01-15)