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Q217336: TCP/IP Source Routing Feature Cannot Be Disabled

Article: Q217336
Product(s): Microsoft Windows NT
Version(s): winnt:4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.5
Operating System(s): 
Keyword(s): kbWinNT400sp5fix
Last Modified: 11-JUN-2002

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The information in this article applies to:

- Microsoft Windows NT Workstation versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4 
- Microsoft Windows NT Server versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4 
- Microsoft Windows NT Server, Enterprise Edition versions 4.0, 4.0 SP4 
- Microsoft BackOffice Server versions 4.0, 4.5 
- Microsoft Windows NT Server versions 4.0, 4.0 SP4, Terminal Server Edition 
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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

  Q256986 Description of the Microsoft Windows Registry

SYMPTOMS
========

On a computer running Windows NT 4.0, you cannot disable the source routing
feature for the TCP/IP protocol.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Windows NT 4.0. For
additional information, please see the following article in the Microsoft
Knowledge Base:

  Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack


WARNING: If you use Registry Editor incorrectly, you may cause serious problems
that may require you to reinstall your operating system. Microsoft cannot
guarantee that you can solve problems that result from using Registry Editor
incorrectly. Use Registry Editor at your own risk.

After you apply the fix referenced above, perform the following steps to enable
and disable source routing:

1. Start Registry Editor (Regedt32.exe).

2. Locate the following key in the registry:

  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
 

3. On the Edit menu, click Add Value, and then add the following registry
  value:

  Value Name: DisableIPSourceRouting
  Data Type:  REG_DWORD
  Value:      0 , 1 or 2
  Note:       0 - enables source routing 
              1 - disables source routing when IP forwarding is also enabled
              2 - disables source routing completely (recommended for best security)

4. Quit Registry Editor.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Windows NT 4.0. This
problem was first corrected in Windows NT version 4.0 Service Pack 5.


Additional query words:

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Keywords          : kbWinNT400sp5fix 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTW400sp4 kbWinNTW400sp3 kbWinNTW400sp2 kbWinNTW400sp1 kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp4 kbWinNTSEnt400 kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400sp2 kbWinNTS400sp1 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServ400sp4 kbNTTermServSearch kbAudDeveloper kbBackOfficeSearch kbBackOfficeServ400 kbBackOfficeServ450
Version           : winnt:4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.5
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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