Microsoft KB Archive/151761

= How to prevent a WINS server from sending IGMP packets when the WINS service starts =

Article ID: 151761

Article Last Modified on 2/21/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q151761





Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SUMMARY
When the Windows Internet Name Service (WINS) starts, it automatically sends IGMP packets to multicast address 224.0.1.24. These multicast packets are sent by the WINS service to look for possible replication partners. WINS periodically sends information about itself by using these packets.

If you do not want WINS to send multicast packets, set the UseSelfFndPnrs registry entry under Wins\Parameters to DWORD 1. Also, set the McastIntvl registry entry to 0x0FFFFFFF.

Note The McastIntvl registry key is read when the UseSelfFndPnrs value is set to 1. By default the interval is 2400 (40 minutes).



MORE INFORMATION
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Automatic partner configuration
You can instruct the WINS server to automatically configure itself for replication. WINS servers announce their presence through periodic announcements. When you set up a WINS server for automatic replication configuration, the server looks for these announcements and adds the IP addresses of any new WINS servers it finds as both push and pull partners. The server performs pull replication every 2 hours. If a WINS server is discovered through multicasting, it is removed as a partner after it stops gracefully, unless the administrator has used WINS Manager to touch this WINS server's partnership-related information in the registry.

Set the UseSelfFndPnrs registry entry to 1
Use Registry Editor to set the UseSelfFndPnrs registry entry to 1. To do this, follow these steps:  Click Start, click Run, type cmd, and then click OK. In Registry Editor, locate the following registry subkey:

 Double-click UseSelfFndPnrs. In the Edit DWORD Value dialog box, click the Decimal option under Base, type 1 in the Value data box, and then click OK.

The following table describes the UseSelfFndPnrs registry entry. Entry Value Name UseSelfFndPnrs Data type        REG_DWORD Description:     If the parameter is set to 1 and network routers support multicasting, the WINS server automatically finds other WINS servers on the network and configures them as push and pull partners. If the parameter is set to 1 and network routers do not support multicasting, the WINS server finds only those WINS servers that are on its own subnet.

Range            0 or 1 Default value    0

Set the McastIntvl registry entry to 0x0FFFFFFF
Use Registry Editor to set the McastIntvl registry entry to 0x0FFFFFFF. To do this, follow these steps:  Click Start, click Run, type cmd, and then click OK.</li> In Registry Editor, locate the following registry subkey:

</li> Double-click McastIntvl.</li> In the Edit DWORD Value dialog box, click the Hexadecimal option under Base, type 0x0FFFFFFF in the Value data box, and then click OK.</li></ol>

The following table describes the McastIntvl registry entry. <pre class="fixed_text">Entry Value Name McastIntvl Data type        REG_DWORD Description      This parameter specifies the time interval (in seconds) at which the WINS server sends a multicast announcement to announce its presence to other WINS servers.

Range            The minimum value is 2400 seconds (40 minutes). Default value    2400 (seconds)

Keywords: KB151761

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