INVERSE ADDRESS RESOLUTION PROTOCOL
\ɪnvˈɜːs ɐdɹˈɛs ɹˌɛzəlˈuːʃən pɹˈə͡ʊtəkˌɒl], \ɪnvˈɜːs ɐdɹˈɛs ɹˌɛzəlˈuːʃən pɹˈəʊtəkˌɒl], \ɪ_n_v_ˈɜː_s ɐ_d_ɹ_ˈɛ_s ɹ_ˌɛ_z_ə_l_ˈuː_ʃ_ə_n p_ɹ_ˈəʊ_t_ə_k_ˌɒ_l]\
Definitions of INVERSE ADDRESS RESOLUTION PROTOCOL
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(InARP) Additions to ARP typicallyused for Frame Relay. [Any other examples of its use?]Frame Relay stations route frames of a higher levelprotocol between LANs, across a Permanent Virtual Circuit.These stations are identified by their Data Link ControlIdentifier (DLCI), equivalent to an Ethernet address in aLAN itself.InARP allows a station to determine a protocol address (e.g.IP address) from a DLCI. This is useful if a new virtualcircuit becomes available. Signalling messages announce itsDLCI, but without the corresponding protocol address it isunusable: 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 IPAddress?" whereas InARP answers the question "What is yourprotocol address?".See RFC 2390.
By Denis Howe