When your computer starts, it broadcasts a packet containing its' TCP/IP address, so that duplicate addresses can be prevented. This is known as a gratuitous Address Resolution Protocol (ARP) packet.
For performance and/or maintenance reasons, you may wish to disable this function.
NOTE: For Windows NT 4.0, you must be running SP5 or greater.
Use Regedt32 to navigate to:
On the Edit menu, Add Value name ArpRetryCount, as a REG_DWORD data type.
For Windows NT 4.0, set the data value to 0, and press OK.
For Windows 2000, set the data value to 1, and press OK.
The default data value is 3.