This article was previously published under Q217336
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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:
256986 Description of the Microsoft Windows Registry
On a computer running Windows NT 4.0, you cannot disable the source routing feature for the TCP/IP protocol.
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 theMicrosoft Knowledge Base:
152734 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:
On the Edit menu, click Add Value, and then add the followingregistry 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)
Quit Registry Editor.
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.