WINS Server Sends IGMP Packets on Startup

• Microsoft Windows NT Workstation version 3.51
• Microsoft Windows NT Server version 3.51 --------------------------------------------------------------------------

SUMMARY

When you start up the Windows Internet Naming Service (WINS) on Windows NT 3.51, it automatically sends IGMP packets to multicast address 224.0.1.24. This is a multicast packet sent by the WINS service looking for possible replication partners. WINS periodically sends information about itself by means of these packets.

If you do not want these multicast packets to be sent, set UseSelfFndPnrs in the registry under Wins\Parameters to DWORD 0 and also set McastIntvl to some huge value (DWORD FFFFFFFF for instance; by default the interval is 2400, that is, 40 minutes).

MORE INFORMATION

Automatic Partner Configuration

You can instruct the WINS server to configure itself automatically for replication. WINS servers announce their presence through periodic announcements. If you set up a WINS server for automatic replication configuration, it monitors for these announcements and adds the IP addresses of any new WINS servers it finds as both push and pull partners. It performs pull replication every 2 hours. If a WINS server is discovered through multicasting, it is removed as a partner after it terminates gracefully, unless the administrator has made changes to or simply touched this WINS server's partnership-related information in the Registry using WINS Manager.

UseSelfFndPnrs

WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

Use the Registry Editor to set the UseSelfFndPnrs entry under the following Registry key:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Wins\Parameters

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
                  subnetwork.
Range             0 or 1
Default value     0

McastIntvl

WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

Use the Registry Editor to set the McastIntvl entry under the following Registry key:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Wins\Parameters

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 allowable value is 2400 seconds (40 minutes).
Default value     2400 (seconds)

McastTtl

WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

Use the Registry Editor to set the McastTtl entry under the following Registry key:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Wins\Parameters

Entry ValueName McastTtl

Data type        REG_DWORD
Description      This parameter specifies the number of jumps across a
                 router that a WINS multicast announcement can take.
Range            1 to 32
Default value    6