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IP ARP process query

Posted on 2011-10-05
Medium Priority
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

Accepted Solution

ncollings earned 2000 total points
ID: 36916185

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

ID: 36916249
hi ncollings,

thanks for the clarification on that, appreciate it.

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