Microsoft KB Archive/117375

= BCASTADDR Functionality Not Included in Windows NT =

Article ID: 117375

Article Last Modified on 12/1/2003

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APPLIES TO


 * Microsoft LAN Manager 2.1 Standard Edition
 * Microsoft LAN Manager 2.2 Standard Edition
 * Microsoft Windows for Workgroups 3.1
 * Microsoft Windows for Workgroups 3.11
 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1

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This article was previously published under Q117375



SUMMARY
LAN Manager versions 2.1 and 2.2 and Windows for Workgroups version 3.11 allow an entry in the PROTOCOL.INI file, [tcpip] section for BCASTADDR. This functionality is not included in Windows NT or Windows NT Advanced Server.



MORE INFORMATION
In LAN Manager and Windows for Workgroups, this TCP/IP parameter forces the IP address used to broadcast name requests. It allows an address of 255.255.255.255 or 0.0.0.0 to be used for this purpose.

The following Windows NT Registry entry affects the broadcast address, but only the last two octets:   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ \parameters \tcpip

BroadcastType   REG_DWORD This value can be 0 or 1 (1 by default) Assume a workstation has a TCP/IP address of 130.24.48.140 and a subnet mask of 255.255.0.0. The workstation address is ANDed with the subnet mask to find the first two octets of 130.24. When BroadcastType is set to 1, the broadcast address becomes 130.24.255.255. When BroadcastType is set to 0, the broadcast address becomes 130.24.0.0.

