How to enable TCP/IP Forwarding on Windows XP

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.

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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.

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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