BCASTADDR Functionality Not Included in Windows NT

ID: Q117375

The information in this article applies to:

Microsoft LAN Manager versions 2.1 and 2.2
Microsoft Windows for Workgroups versions 3.1, 3.11
Microsoft Windows NT operating system version 3.1
Microsoft Windows NT Advanced Server version 3.1

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\<adapter name#>
      \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.

REFERENCES

Microsoft LAN Manager "Installation and Configuration Guide," version 2.2,


   pages 195 - 196

Microsoft LAN Manager "Installation and Configuration Guide," version 2.1,


   pages 181 - 182

Microsoft Windows for Workgroups Resource Kit, "Addendum for Operating


   System Version 3.11," pages 6 - 19, 6 - 20

Microsoft Windows NT Resource Kit, "Windows NT Resource Guide," Volume 1,


   page 486

Additional query words: prodnt wfw wfwg 3.10

Keywords : ntprotocol
Version : 3.10
Platform : WINDOWS
Issue type :