ARP cache timeout changed in Windows Vista and 2008

You might remember that Address Resolution Protocol (ARP) has a local cache that prevents
broadcasting for a system whose MAC address has been resolved. Older versions of
Windows used to have a timeout of 2 minutes for ARP entries (up to 10 minutes), this
has changed. Vista and 2008 has lowered this time to a random value between 15 seconds
and 45 seconds:

http://support.microsoft.com/kb/949589

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