Protocol Deep Dive: ARP

Overview

The Address Resolution Protocol (ARP) allows for conversion from a network layer address to a hardware layer address (e.g. from the IP address to the MAC address).  It is defined by RFC 826, and is a layer 2 protocol in the OSI model.  For simplicity, this article will refer to IP address resolutions in examples.

Prerequisites

    • Two systems that each know their own IP address and MAC address
    • A usable network layer path between the two systems
    • The sending system must know the IP address of the destination system

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