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I work in Network Security and prior to that was 3rd level Network Support. Stevens: "RARP is used by systems without a disk drive (.) but requires manual configuration by the system administrator." BTW the ethertype for ARP is 0x0806, and for RARP 0x8035. It has *no* other use to that address assignment role. When diskless workstations were common it was used, one server machine (with a hard disk!) was configured with a list of what IP Addresses to give to what diskless workstations.

On RARP, well I wondered when it would be mentioned. "converting" well what term would you prefer, "find the mapping to"? "ARP is used to find the mapping to MAC Address for an IP Address", yikes!. One might have a better chance of finding the device by looking in the router's ARP cache table. We can then see if there's a Windows API to effect that.Īs Karthikeya said the only useful way of using ARP for this is to hope that the local device has been communicating with the device with that MAC Address, one can then look in the ARP cache for that entry. 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.