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Gratuitous ARP

Discussion in 'Networks' started by george_gp, Jul 17, 2009.

  1. george_gp

    george_gp New Member

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    Hello,

    I have the following question.

    A windows machine, when starting it will broadcast 3 Gratuitous ARP packets.

    These packets are broadcasted to all networks. When another station in the network receives this broadcast, will it automatically update its ARP cache?

    I know that with Regular ARP this is not the case, but what about Gratuitous ARP?

    I am a bit confused because i read the following in the wireskark FAQ:
    link


    The above, is it just in the case that we have Clusters? Because I run Wireshark and I can not see any updates in any ARP cache in my systems when a Gratuitous ARP is firsly broadcasted.

    Thank you, any help will be appreciated
     
  2. Spice_Weasel

    Spice_Weasel Kilobyte Poster

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    If I recall correctly, in general Windows will not populate the arp cache with information from a gratuitous arp, but Linux will.

    Spice Weasel
     
    Certifications: CCNA, CCNP, CCIP, JNCIA-ER, JNCIS-ER,MCP
    WIP: CCIE
  3. george_gp

    george_gp New Member

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    That΄s also what I think. Using wireshark I didn΄t see any update in the ARP cache with information from a gratuitous ARP.

    So, the text that I quote earlier, i.e. the FAQ from wireshark, is it oriented for Linux or maybe for special NIC΄s that support this operation?

    Thank you
     

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