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How is IP address mapping conducted in ARP? What is RARP?

EXPERT RESPONSE FROM: Silvia Hagen

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QUESTION POSED ON: 17 March 2005
How is IP address mapping conducted in ARP? What is RARP?

EXPERT RESPONSE
ARP is the Address Resolution Protocol and is used by IPv4 nodes to resolve the link-layer address for a given IP address. RARP is the Reverse Address Resolution Protocol and does the opposite; it resolves the IP address for a given link-layer address. Find a detailed description of how ARP works in my book Novell's Guide to Troubleshooting TCP/IP, ISBN 0-7645-4562-0.

IPv6 does not use ARP or RARP anymore. With IPv6 link-layer address resolution is done as part of Neighbor Discovery (ND) and uses ICMPv6 messages.

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Terms from Whatis.com − the technology online dictionary

32-bit IP addressing (SearchNetworking.com)

fixed-length subnet mask (SearchNetworking.com)

GARP (Generic Attribute Registration Protocol) (SearchNetworking.com)

route aggregation (SearchNetworking.com)

route summarization (SearchNetworking.com)

routing table (SearchNetworking.com)

subnet (SearchNetworking.com)

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