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-#NOFNR Flag in LMHosts to Communicate Across Routers
-
- Last reviewed: May 5, 1997
- Article ID: Q103765
- The information in this article applies to:
-
- Microsoft Windows NT operating system version 3.1
- Microsoft Windows NT Advanced Server version 3.1
-
- SUMMARY
-
- Some of the LAN Manager for UNIX and Pathworks servers may have
-problems in communicating across routers with
- Windows NT workstations. The use of #NOFNR flag in the LMHosts
-file solves the problem.
-
- MORE INFORMATION
-
- When you are communicating with a server across a router in a IP
-routed environment, the LMHosts file is used to
- resolve Workstation name-to-IP address mapping. The LMHosts
-entry for a remote machine name provides the IP
- address for the remote machine. In Lan Manager 2.x, providing
-the LMHosts entry eliminates the need to do a Name
- Query broadcast to the local domain and instead a TCP session is
-established with the remote machine. Windows NT
- performs the same function in a different way.
-
- When an LMHosts entry exists for a remote server, Windows NT
-will not send a Name Query broadcast to the local
- subnet and instead send a directed Name Query to the remote
-server. If the remote server does not respond to the Name
- Query, further communications (TCP SYN, and so on) will not take
-place. This was done to eliminate the performance
- issues when trying to connect to a remote machine when it was
-not available (down).
-
- Some of the older LAN Manager for UNIX and DEC Pathworks servers
-do not respond to directed Name Queries sent
- by Windows NT. In that case, the users will see an error 53
-(Path not found), even though they have specified the
- LMHosts entries correctly. A new LMHosts flag #NOFNR was added
-to solve this problem. By specifying the
- #NOFNR flag on the same line where the name resolution
-information for the server is provided, the directed Name
- Query can be avoided. For example:
-
- 130.20.1.1 mylmxserver #PRE #NOFNR
-
-
- Note that this will only apply to mylmxserver and not to any
-other entries in the LMHosts file. To set
- a global flag, an entry could be added in the registry. To
-completely remove any directed Name
- Queries sent from a Windows NT machine, create the following
-value in
-
-HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Nbt\Parameters:
-
- NoDirectedFNR REG_DWORD 1
-
-
- This will cause the directed Name Queries to not go out for any