(Address Resolution Protocol) A TCP/IP protocol used to obtain a node's physical address. A client station broadcasts an ARP request onto the network with the IP address of the target node it wishes to communicate with, and the node with that address responds by sending back its physical address so that packets can be transmitted. ARP returns the layer 2 address for a layer 3 address.
Since an ARP gets the message to the target machine, one might wonder why bother with IP addresses in the first place. The reason is that ARP requests are broadcast onto the network, requiring every station in the subnet to process the request. See RARP.
ARP'ing
The IP protocol broadcasts the IP address of the destination station onto the network, and the node with that address responds.
Since an ARP gets the message to the target machine, one might wonder why bother with IP addresses in the first place. The reason is that ARP requests are broadcast onto the network, requiring every station in the subnet to process the request. See RARP.
ARP'ing
The IP protocol broadcasts the IP address of the destination station onto the network, and the node with that address responds.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2009 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- The ARP Gadget
- Windows offers a command-line utility that lets you examine or modify the ARP cache. To make the tool easier to use, Greg Shultz has 'gadgetized' it for Vista and Windows 7. Visit our Microsoft Windows blog for more Windows information and resources.
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- Software downloads 2009-09-02
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- Software downloads 2009-08-25
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