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TCP/IP Source Routing Feature Cannot Be Disabled

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Article ID:217336
Last Review:February 22, 2007
Revision:2.3
This article was previously published under Q217336

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:
256986 (http://support.microsoft.com/kb/256986/EN-US/) 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.

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RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
152734 (http://support.microsoft.com/kb/152734/EN-US/) 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.

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STATUS

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

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APPLIES TO
•Microsoft Windows NT Server 4.0, Terminal Server Edition Service Pack 4
•Microsoft Windows NT Workstation 4.0 Developer Edition
•Microsoft Windows NT Server 4.0 Standard Edition
•Microsoft Windows NT 4.0 Service Pack 1
•Microsoft Windows NT 4.0 Service Pack 2
•Microsoft Windows NT 4.0 Service Pack 3
•Microsoft Windows NT 4.0 Service Pack 4
•Microsoft Windows NT Server 4.0 Enterprise Edition
•Microsoft BackOffice Server 4.0
•Microsoft BackOffice Server 4.5

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Keywords: 
kbbug kbfix kbqfe kbhotfixserver KB217336

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