Article ID: 269734 - Last Review: March 1, 2007 - Revision: 3.3

Router Discovery Protocol Is Disabled by Default

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This article was previously published under Q269734
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
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SUMMARY

The Microsoft Windows 2000 Resource Kit incorrectly states that the registry parameter PerformRouterDiscovery is enabled by default.

MORE INFORMATION

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.

Windows 2000 supports Internet Router Discovery Protocol (IRDP) to detect and configure Default Gateway addresses on the computer. The registry parameter PerformRouterDiscovery is used to enable or disable this protocol. For additional information about this feature, click the article number below to view the article in the Microsoft Knowledge Base:
223756  (http://support.microsoft.com/kb/223756/EN-US/ ) IRDP Client Support Added to Windows NT 4.0
To configure Router Discovery, follow these steps:
  1. Start Registry Editor (Regedt32.exe).
  2. Locate, and click the following key in the registry:
    HKEY_LOCAL_Machine\System\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\interface_name
  3. On the Edit menu, click Add Value, and then add the following registry value:
    Value Name: PerformRouterDiscovery
    Data Type:REG_DWORD
    Valid Range: 0,1
    Default: 0
    Description: This parameter controls whether Windows 2000 will attempt to perform router discovery per RFC 1256 on a per-interface basis. This parameter defaults to 0 or FALSE.
  4. Quit Registry Editor.
This registry parameter is disabled by default, and can be enabled if necessary, by setting the above registry parameter to 1.
APPLIES TO
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
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kbenv kbinfo KB269734