IP ARP process query

Posted on 2011-10-05
Last Modified: 2012-05-12
Just a qucik question guys regarding the ARP process for machines on an Ethernet LAN.

When sending an ARP query in order to obtain a MAC address for a PC, does the sending machine use layer 3 addressing in the query packet? or does it just use layer 2 addressing. i assume it just uses layer 2 addressing, with the qurey going out to the ethernet broadcast layer 2 address ffff.ffff.ffff., and the rest of the packet is just the payload, so no layer 3 addressing used.

please can somebody confirm if my assumption above is correct?

thank you in advance.
Question by:L-Plate
    LVL 3

    Accepted Solution


    You are correct the arp request is broadcast on layer 2 FF:FF:FF:FF:FF:FF address. The target IP is included so the receiving machine can compare the request to it's own IP and reply of they match.

    Author Comment

    hi ncollings,

    thanks for the clarification on that, appreciate it.

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