Article ID: 219374 - View products that this article applies to.
This article was previously published under Q219374
When a Windows NT-based 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. Routers and other network hardware may cache routing information gained from multiple gratuitous ARP packets. For both performance and maintenance reasons, it is possible to disable this feature in Windows NT.
To resolve this problem, obtain the latest service pack for Windows NT 4.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/152734/EN-US/ )How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows NT 4.0 Service Pack 5.
To disable gratuitous ARPs after applying this hotfix:
(http://support.microsoft.com/kb/199773/EN-US/ )Behavior of Gratuitous ARP in Windows NT 4.0
Article ID: 219374 - Last Review: February 24, 2007 - Revision: 3.2