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How can I disable Gratuitous ARP?

A. When a Windows NT/2000 computer starts, a packet is broadcast on the network containing the computer's TCP/IP address to prevent the use of duplicate addresses on the same network. This is called a gratuitous Address Resolution Protocol (ARP) packet.

For both performance and maintenance reasons, it is possible to disable this feature in Windows NT if you have Service Pack 5 installed or any version of Windows 2000.

  1. Start the registry editor (regedit.exe)
  2. Move to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  3. Double-click the ArpRetryCount value, type 0, and then click OK. If it does not exist create of type REG_DWORD
  4. Close the registry editor
  5. Reboot the machine

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