Replacing ARP cache entry when receiving gratuitous ARP

Discussion in 'Windows Networking' started by pavius, Oct 18, 2007.

  1. pavius

    pavius Guest

    Hi.

    Simple scenario: Windows machine learns that IP:A resides on MAC:A. A
    gratuitous ARP is received saying that IP:A now resides under MAC:B.
    Windows, by default, will ignore this and retain IP:A resides on MAC:A
    in its ARP cache. Is there a way to configure Windows to replace
    updated cache entries (as it should)?

    Thanks
     
    pavius, Oct 18, 2007
    #1
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  2. ARP entries don't "live" long enough to matter.
    Sometimes they aren't even the true MAC of the target Host anyway,...they
    are the MAC of the router between the two segments when more than one
    segment exists.
    The machine will discover the correct MAC the next time it has to
    communicate with that particular Host.

    --
    Phillip Windell
    www.wandtv.com

    The views expressed, are my own and not those of my employer, or Microsoft,
    or anyone else associated with me, including my cats.
     
    Phillip Windell, Oct 19, 2007
    #2
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