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Gratuitous in this case means a request/reply that is not normally needed according to the ARP specification (RFC 826) but could be used in some cases. A gratuitous ARP request is an AddressResolutionProtocol request packet where the source and destination IP are both set to the IP of the machine issuing the packet and the destination MAC is the broadcast address ff:ff:ff:ff:ff:ff. Ordinarily, no reply packet will occur. A gratuitous ARP reply is a reply to which no request has been made.

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Related Questions

What rhymes with gratuitous?

There are no perfect rhymes for the word gratuitous.


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Gratuitous means unwarranted. It can also man done free of charge. Dinner was gratuitous with your room rental. Gratuitous advice is not always welcome.


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Gratuitous Space Battles happened in 2009.


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I chose not to view films featuring gratuitous violence!


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There was gratuitous violence in the movie, which many people did not like.


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