Microsoft KB Archive/230381

= TCP/IP Dead Gateway Detection May Not Work if the ARP Cache is Empty =

Article ID: 230381

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Server 4.0 Enterprise Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q230381



SYMPTOMS
The Dead Gateway Detection algorithm may not properly attempt to switch gateways in the correct sequence when there are no entries in the ARP cache.



CAUSE
This problem occurs because the Tcpip.sys driver that shipped with Windows NT 4.0 Service Pack 4 and Service Pack 5 does not properly attempt to arp for gateways in the correct order if there are no entries in the ARP cache.



Windows NT Server or Workstation 4.0
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:


 * http://www.microsoft.com/windows/servicepacks/ -or-


 * 152734 how to obtain the latest windows nt 4.0 service pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/directory/overview.asp

Windows NT Server 4.0, Terminal Server Edition
To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack



WORKAROUND
To work around this problem, add a static entry to the arpcache using the ARP command.



STATUS
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 Server version 4.0, Terminal Server Edition Service Pack 6.

Additional query words: dead gateway fail

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB230381

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