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Q246988: Default Gateway Is Ignored When IRDP Is Enabled

Article: Q246988
Product(s): Microsoft Windows NT
Version(s): winnt:4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Operating System(s): 
Keyword(s): kbnetwork kbWinNT400PreSP7Fix
Last Modified: 08-MAY-2002

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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 
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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 described in this article and should be applied only to
systems 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 on support costs, please go to the following address on the World
Wide Web:

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

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal 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 this to be 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:

  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 kbWinNT400PreSP7Fix 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400search kbWinNT400search kbWinNTW400sp5 kbWinNTW400sp4 kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp6 kbWinNTSEnt400sp5 kbWinNTSEnt400sp4 kbWinNTS400sp6 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400search kbWinNTW400sp6 kbWinNTSEnt400SP6a kbWinNTW400SP6a
Version           : winnt:4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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