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How to Enable TCP/IP Forwarding in Windows XP

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article was previously published under Q315236
For a Microsoft Windows 2000 version of this article, see 230082.

SUMMARY
This article describes how to enable Transmission Control Protocol/Internet Protocol (TCP/IP) forwarding on a Windows XP-based computer. By default, TCP/IP forwarding is not enabled in Windows XP.
MORE INFORMATION
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows

To enable TCP/IP forwarding, follow these steps:
  1. Start Registry Editor (Regedit.exe).
  2. In Registry Editor, locate the following registry key:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  3. Set the following registry value:
    Value Name: IPEnableRouter
    Value type: REG_DWORD
    Value Data: 1
    A value of 1 enables TCP/IP forwarding for all network connections that are installed and used by this computer.
  4. Quit Registry Editor.
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Article ID: 315236 - Last Review: 06/11/2002 09:20:00 - Revision: 1.3

  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
  • kbenv kbinfo kbnetwork KB315236
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