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

Silvia Hagen

Sunny Connection AG
Published: 17 Mar 2005

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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