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what is Reverse Address Resolution Protocol (RARP)

Posted Tue, 10/05/2010 - 06:12 by rajesh
ARP (Address Resolution Protocol) is a data link layer protocol and is used to find MAC (Media Access Control) Address from destination IP address.
 
This article tell how does RARP works. RARP is Reverse Address Resolution Protocol that determines source network address (IP address) from source data link address MAC (Media Access Control) address. RARP is used to determine system’s own IP address when it comes up. When system boots it sends a RARP request which contains its own layer 2(Data link layer) MAC address to Ethernet broadcast address. RARP server in the subnet which contains the mapping table from MAC address to IP address responds to such requests with corresponding IP address. RARP is used in Ethernet, Fiber Distributed-Data Interface (FDDI) and Token Ring LANs.
 
 DHCP (Dynamic Host Configuration Protocol) is modern implementation of RARP, Which allocates IP address dynamically when system comes up. Thus IP address can be reused if it is no longer needed.

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