If you know some way to magically have ARP reverse its role and do the opposite mapping operation then show us the binary content of the ARP packet which would accomplish that. standard method for finding a host's hardware address when only its network layer address is known." Translate an address A in protocol P's address space into a "Presented here is a protocol that allows dynamicĭistribution of the information needed to build tables to RFC 826 - An Ethernet Address Resolution Protocol: the target's hardware address is indeed unknown when the request is sent. "ARP: This is a message sent to the data link layer broadcast address indicating a network layer address for which the transmitter seeks a corresponding data link layer address." "ARP provides a dynamic mapping from an IP address to the corresponding hardware address." Stevens / TCP/IP Illustrated, Volume 1 - The Protocols: It is /not/ for converting a MAC Address to an IP Address. I state again, ARP is used to convert an IP Address *to* a MAC Address.
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