nmbd



NMBD(8)                                                                NMBD(8)




NAME

       nmbd  -  NetBIOS name server to provide NetBIOS over IP naming services
       to clients


SYNOPSIS

       nmbd [-D] [-F] [-S] [-a] [-i] [-o] [-h] [-V] [-d <debug level>]
            [-H <lmhosts file>] [-l <log directory>] [-p <port number>]
            [-s <configuration file>]



DESCRIPTION

       This program is part of the samba(7) suite.


       nmbd is a server that understands and can reply to NetBIOS over IP name
       service  requests, like those produced by SMB/CIFS clients such as Win-
       dows 95/98/ME, Windows NT, Windows  2000,  Windows  XP  and  LanManager
       clients.  It  also participates in the browsing protocols which make up
       the Windows "Network Neighborhood" view.


       SMB/CIFS clients, when they start up, may wish to  locate  an  SMB/CIFS
       server.  That  is, they wish to know what IP number a specified host is
       using.


       Amongst other services, nmbd will listen for such requests, and if  its
       own NetBIOS name is specified it will respond with the IP number of the
       host it is running on. Its "own NetBIOS name" is by default the primary
       DNS  name  of  the host it is running on, but this can be overridden by
       the netbios name in smb.conf. Thus nmbd will reply to broadcast queries
       for its own name(s). Additional names for nmbd to respond on can be set
       via parameters in the smb.conf(5) configuration file.


       nmbd can also be used as a WINS (Windows Internet Name Server)  server.
       What  this basically means is that it will act as a WINS database serv-
       er, creating a database from name registration  requests  that  it  re-
       ceives and replying to queries from clients for these names.


       In  addition,  nmbd can act as a WINS proxy, relaying broadcast queries
       from clients that do not understand how to talk the WINS protocol to  a
       WINS server.



OPTIONS

       -D     If  specified, this parameter causesnmbd to operate as a daemon.
              That is, it detaches itself and runs in the background, fielding
              requests  on the appropriate port. By default, nmbd will operate
              as a daemon if launched from a command shell. nmbd can  also  be
              operated from the inetd meta-daemon, although this is not recom-
              mended.


       -F     If specified, this parameter causes the main nmbd process to not
              daemonize,  i.e. double-fork and disassociate with the terminal.
              Child processes are still created as normal to service each con-
              nection request, but the main process does not exit. This opera-
              tion mode is suitable for runningnmbd under process  supervisors
              such  as supervise and svscan from Daniel J. Bernstein’s daemon-
              tools package, or the AIX process monitor.


       -S     If specified, this parameter causesnmbd to log to standard  out-
              put rather than a file.


       -i     If  this parameter is specified it causes the server to run "in-
              teractively", not as a daemon, even if the server is executed on
              the  command line of a shell. Setting this parameter negates the
              implicit daemon mode when run from the command line.  nmbd  also
              logs  to standard output, as if the -S parameter had been given.


       -h|--help
              Print a summary of command line options.


       -H <filename>
              NetBIOS lmhosts file. The lmhosts file  is  a  list  of  NetBIOS
              names to IP addresses that is loaded by the nmbd server and used
              via the name resolution mechanism name resolve  order  described
              in smb.conf(5) to resolve any NetBIOS name queries needed by the
              server. Note that the contents of this file are NOT used by nmbd
              to  answer  any name queries. Adding a line to this file affects
              name NetBIOS resolution from this host ONLY.

              The default path to this file is compiled into Samba as part  of
              the   build   process.   Common   defaults  are  /usr/local/sam-
              ba/lib/lmhosts,/usr/samba/lib/lmhosts or/etc/samba/lmhosts.  See
              the  lmhosts(5)  man  page  for  details on the contents of this
              file.


       -V     Prints the program version number.


       -s <configuration file>
              The file specified contains the configuration  details  required
              by the server. The information in this file includes server-spe-
              cific information such as what printcap file to use, as well  as
              descriptions  of all the services that the server is to provide.
              See smb.conf for more  information.  The  default  configuration
              file name is determined at compile time.


       -d|--debug=debuglevel
              debuglevel is an integer from 0 to 10. The default value if this
              parameter is not specified is zero.

              The higher this value, the more detail will be logged to the log
              files about the activities of the server. At level 0, only crit-
              ical errors and serious warnings will be logged. Level  1  is  a
              reasonable  level  for day-to-day running - it generates a small
              amount of information about operations carried out.

              Levels above 1 will generate considerable amounts of  log  data,
              and  should  only  be  used when investigating a problem. Levels
              above 3 are designed for use only  by  developers  and  generate
              HUGE amounts of log data, most of which is extremely cryptic.

              Note  that specifying this parameter here will override the  pa-
              rameter in the smb.conf file.


       -l|--logfile=logdirectory
              Base directory name for log/debug files. The  extension  ".prog-
              name"  will  be appended (e.g. log.smbclient, log.smbd, etc...).
              The log file is never removed by the client.


       -p <UDP port number>
              UDP port number is a positive integer value. This option changes
              the default UDP port number (normally 137) that nmbd responds to
              name queries on. Don’t use this option unless you are an expert,
              in which case you won’t need help!



FILES

       /etc/inetd.conf
              If  the  server  is to be run by theinetd meta-daemon, this file
              must contain suitable startup information for the meta-daemon.


       /etc/rc
              or whatever initialization script your system uses).

              If running the server as a daemon at  startup,  this  file  will
              need  to contain an appropriate startup sequence for the server.


       /etc/services
              If running the server via the meta-daemon inetd, this file  must
              contain a mapping of service name (e.g., netbios-ssn) to service
              port (e.g., 139) and protocol type (e.g., tcp).


       /usr/local/samba/lib/smb.conf
              This is the default location of the smb.conf(5) server  configu-
              ration  file. Other common places that systems install this file
              are /usr/samba/lib/smb.conf and /etc/samba/smb.conf.

              When run as a WINS server (see thewins support parameter in  the
              smb.conf(5)  man  page),nmbd will store the WINS database in the
              file wins.dat in the var/locks directory configured under  wher-
              ever Samba was configured to install itself.

              If  nmbd is acting as a  browse master (see the local master pa-
              rameter in the smb.conf(5) man page, nmbd will store the  brows-
              ing  database in the file browse.dat  in the var/locks directory
              configured under wherever Samba was configured  to  install  it-
              self.



SIGNALS

       To shut down an nmbd process it is recommended that SIGKILL (-9) NOT be
       used, except as a last resort, as this may leave the name  database  in
       an  inconsistent state. The correct way to terminate nmbd is to send it
       a SIGTERM (-15) signal and wait for it to die on its own.


       nmbd will accept SIGHUP, which will cause it to dump out its  namelists
       into  the file namelist.debug  in the /usr/local/samba/var/locks direc-
       tory (or the var/locks directory configured under  wherever  Samba  was
       configured  to  install  itself). This will also cause nmbd to dump out
       its server database in the log.nmb file.


       The debug log level of nmbd may be  raised  or  lowered  using  smbcon-
       trol(1)  (SIGUSR[1|2] signals are no longer used since Samba 2.2). This
       is to allow transient problems to be diagnosed, whilst still running at
       a normally low log level.



VERSION

       This man page is correct for version 3.0 of the Samba suite.



SEE ALSO

       inetd(8), smbd(8), smb.conf(5), smbclient(1), testparm(1), testprns(1),
       and the Internet RFC’s rfc1001.txt, rfc1002.txt. In addition  the  CIFS
       (formerly  SMB)  specification is available as a link from the Web page
       http://samba.org/cifs/.



AUTHOR

       The original Samba software and related utilities were created  by  An-
       drew  Tridgell.  Samba  is  now  developed by the Samba Team as an Open
       Source project similar to the way the Linux kernel is developed.


       The original Samba man pages were written by Karl Auer.  The  man  page
       sources  were converted to YODL format (another excellent piece of Open
       Source software, available at ftp://ftp.icce.rug.nl/pub/unix/) and  up-
       dated  for  the  Samba 2.0 release by Jeremy Allison. The conversion to
       DocBook for Samba 2.2 was done by Gerald Carter. The conversion to Doc-
       Book XML 4.2 for Samba 3.0 was done by Alexander Bokovoy.




                                                                       NMBD(8)

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