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Terme informatique

ARP

The mechanism used in IPv4 to find the address(s) that corresponds to a local IP address.

Networking
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Simple definition

The mechanism used in IPv4 to find the address(s) that corresponds to a local IP address.

Technical definition

Address Resolution Protocol broadcasts a request on the local network to associate an IPv4 with an address Mac, and then temporarily keeps the association in a cache.

What is it used for ?

Allow a position to send an Ethernet frame to the right local network equipment.

Practical example

Before contacting 192.168.1.1, a PC may use ARP to discover the address of his gateway.

Common issues

  • Cache ARP obsolete
  • Duplicated IP Address
  • Poisoning ARP on an unprotected network

Address(TM) · IP address · LAN

Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.

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