Microsoft KB Archive/246988

= Default Gateway Is Ignored When IRDP Is Enabled =

Article ID: 246988

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT 4.0 Service Pack 4
 * Microsoft Windows NT 4.0 Service Pack 5
 * Microsoft Windows NT 4.0 Service Pack 6
 * Microsoft Windows NT 4.0 Service Pack 6a
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Workstation 4.0
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT 4.0 Service Pack 4
 * Microsoft Windows NT 4.0 Service Pack 5
 * Microsoft Windows NT 4.0 Service Pack 6
 * Microsoft Windows NT 4.0 Service Pack 6a

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This article was previously published under Q246988



SYMPTOMS
A host computer may lose the connection to one of its gateways.



CAUSE
If a computer that is configured to use Internet Router Discovery Protocol (IRDP) temporarily stops receiving router advertisements from a gateway interface and the default gateway detection routine discovers that the interface is invalid, the route to that gateway interface is deleted from the route table on the computer. If the gateway becomes valid again and starts sending IRDP updates to the computer, the route is not added again.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English-language version of this fix should have the following file attributes or later:   Date       Time      Size      File name   Platform ---  11/22/99   11:23am   171,664   Tcpip.sys   i386 11/22/99  11:21am   305,680   Tcpip.sys   Alpha



WORKAROUND
To work around this problem, restart your computer.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
For additional information about IRDP, click the article number below to view the article in the Microsoft Knowledge Base:

223756 IRDP Client Support Added to Windows NT 4.0

For additional information about default gateway detection, click the article number below to view the article in the Microsoft Knowledge Base:

128978 Dead Gateway Detection in TCP/IP for Windows NT

Keywords: kbbug kbfix kbqfe kbnetwork kbhotfixserver KB246988

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