ARP / Address Resolution Protocol for Not Yet Techies

"Computer Careers: Mapping IP Network Addresses to Local Network Addresses"

by Richard Stooker, President Info Ring Press and author of Secrets of Changing to a Computer Career

ARP / Address Resolution Protocol is for mapping an Internet Protocol (IP) address to a physical machine address that is recognized by the local network. It is part of the TCP/IP suite of protocols. ARP / Address Resolution Protocol resolves differences between network addresses.

For instance packets are coming your way which are an email message for you. To get through the Internet, they're addressed to your IP address, which is 32 bits long. However, your PC is on an Ethernet network, which uses addresses 48 bits long. Obviously, they don't match.

ARP / Address Resolution Protocol provides a table (called a cache) to tell your local network how to match up the IP address with the MAC or Media Access Control address of your PC

A gateway stands where your local network and the Internet intersect and performs the ARP / Address Resolution Protocol function. There are different ones for each type of network, Ethernet, ATM, FDDI, HIPPI and other protocols.

Reverse ARP helps host machines that don't know their IP address. It allows them to request that information from the gateway cache.

Next: BIND Berkeley Internet Name Domain

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