Windows Server 2008/2003, Windows Vista, Windows XP and Windows 2000 by default will respond to ARP requests only if the Ethernet address in an ARP request is unicast. The system will not respond if the incoming ARP request did not have a unicast source ethernet address.
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Gratuitous ARP is a feature of Address Resolution Protocol in which a Gratuitous ARP request is sent by a host for its own IP Address while initiliazing. Gratuitous ARP requests are sent to ensure that the IPv4 address is not already in use on the locally attached subnet.
In Windows 2008 & Windows Vista, we can control the number of Gratuitous ARP requests sent and is set to “3″ by default. To modify the number of Gratuitous ARP entries sent (between 0 and 3)
Windows XP and later provides you with a one step resolution to network problems on your PCs and Servers in the form of a Repair button under the properties of the network connection. This is a simple and effective way to resolve a network problem but do you know what exactly happens when you run this command?