Default Gateway Is Ignored When IRDP Is Enabled

ID: Q246988

The information in this article applies to:

Microsoft Windows NT Server, Enterprise Edition versions 4.0 SP4, 4.0 SP5, 4.0 SP6, 4.0 SP6a
Microsoft Windows NT Workstation versions 4.0 SP4, 4.0 SP5, 4.0 SP6, 4.0 SP6a
Microsoft Windows NT Server versions 4.0 SP4, 4.0 SP5, 4.0 SP6, 4.0 SP6a

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 that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Windows NT service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. 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://www.microsoft.com/support/supportnet/overview/overview.asp

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 this to be a problem in the Microsoft products 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:

Q223756 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:

Q128978 Dead Gateway Detection in TCP/IP for Windows NT

Additional query words:

Keywords : kbnetwork kbbug4.00 kbfix4.00
Version : winnt:4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Platform : winnt
Issue type : kbbug