Networking - What is difference between ARP and RARP?

[hasini]

What is difference between ARP and RARP? <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

[muralipn]

Hi Hasini,

The difference between ARP and RARP is,

ARP - Address Resolution Protocol and
RARP - Reverse Address Resolution Protocol

ARP -


When an Ethernet frame is sent from one host on a LAN to another, it is the 48-bit Ethernet address that determines for which interface the frame is destined. The device driver software never looks at the destination IP address in the IP datagram.
Address resolution provides a mapping between the two different forms of addresses: 32-bit IP addresses and whatever type of address the data link uses.

ARP provides a dynamic mapping from an IP address to the corresponding hardware address. We use the term dynamic since it happens automatically and is normally not a concern of either the application user or the system administrator.

ARAP:
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Each system on a network has a unique hardware address, assigned by the manufacturer of the network interface. The principle of RARP is for the diskless system to read its unique hardware address from the interface card and send an RARP request (a broadcast frame on the network) asking for someone to reply with the diskless system's IP address (in an RARP reply).

Regards,
Murali

[Stranger]

thanks murali............

[jithendra.b]

ARP maps the logical address to the physical address of the machine , where as RARP does the
reverse.