Microsoft KB Archive/323339

= How To Enable TCP/IP Forwarding in Windows Server 2003 =

Article ID: 323339

Article Last Modified on 12/3/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, 64-Bit Datacenter Edition
 * Microsoft Windows Server 2003, Enterprise x64 Edition
 * Microsoft Windows Small Business Server 2003 Standard Edition
 * Microsoft Windows Small Business Server 2003 Premium Edition

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This article was previously published under Q323339



For a Microsoft Windows XP version of this article, see 315236.

For a Microsoft Windows 2000 version of this article, see 230082.

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

IN THIS TASK

 * SUMMARY
 * More Information
 * Enabling TCP/IP Forwarding



SUMMARY
By default, TCP/IP forwarding is turned off (disabled) in Windows Server 2003. This article describes how to enable TCP/IP forwarding on a Windows Server 2003-based computer.

Enabling TCP/IP Forwarding
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.


 * 1) Start Registry Editor (Regedit.exe).
 * 2) Locate and click the following key in the registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
 * 1) Set the following registry values:

Value Name: IPEnableRouter

Value type: REG_DWORD

Value Data: 1

NOTE: A value of 1 turns on (enables) TCP/IP forwarding for all network connections installed and used by this computer.
 * 1) Quit Registry Editor.

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Additional query words: kbnetwork multi-homed multihomed

Keywords: kbenv kbhowtomaster kbnetwork KB323339

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