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<refentry id="nmbd.8">

<refmeta>
	<refentrytitle>nmbd</refentrytitle>
	<manvolnum>8</manvolnum>
	<refmiscinfo class="source">Samba</refmiscinfo>
	<refmiscinfo class="manual">System Administration tools</refmiscinfo>
	<refmiscinfo class="version">3.2</refmiscinfo>
</refmeta>


<refnamediv>
	<refname>nmbd</refname>
	<refpurpose>NetBIOS name server to provide NetBIOS 
	over IP naming services to clients</refpurpose>
</refnamediv>

<refsynopsisdiv>
	<cmdsynopsis sepchar=" ">
		<literal>nmbd</literal>
		<arg choice="opt" rep="norepeat">-D</arg>
		<arg choice="opt" rep="norepeat">-F</arg>
		<arg choice="opt" rep="norepeat">-S</arg>
		<arg choice="opt" rep="norepeat">-a</arg>
		<arg choice="opt" rep="norepeat">-i</arg>
		<arg choice="opt" rep="norepeat">-o</arg>
		<arg choice="opt" rep="norepeat">-h</arg>
		<arg choice="opt" rep="norepeat">-V</arg>
		<arg choice="opt" rep="norepeat">-d &lt;debug level&gt;</arg>
		<arg choice="opt" rep="norepeat">-H &lt;lmhosts file&gt;</arg>
		<arg choice="opt" rep="norepeat">-l &lt;log directory&gt;</arg>
		<arg choice="opt" rep="norepeat">-p &lt;port number&gt;</arg>
		<arg choice="opt" rep="norepeat">-s &lt;configuration file&gt;</arg>
	</cmdsynopsis>
</refsynopsisdiv>

<refsect1>
	<title>DESCRIPTION</title>
	<para>This program is part of the <citerefentry><refentrytitle>samba</refentrytitle>
	<manvolnum>7</manvolnum></citerefentry> suite.</para>

	<para><literal>nmbd</literal> is a server that understands 
	and can reply to NetBIOS over IP name service requests, like 
	those produced by SMB/CIFS clients such as Windows 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.</para>

	<para>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.</para>

	<para>Amongst other services, <literal>nmbd</literal> 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 <link xmlns:xlink="http://www.w3.org/1999/xlink" linkend="NETBIOSNAME" xlink:href="smb.conf.5.html#NETBIOSNAME">netbios name</link>
	in <filename moreinfo="none">smb.conf</filename>. Thus <literal>nmbd</literal> will 
	reply to broadcast queries for its own name(s). Additional
	names for <literal>nmbd</literal> to respond on can be set 
	via parameters in the <citerefentry><refentrytitle>smb.conf</refentrytitle>
	<manvolnum>5</manvolnum></citerefentry> configuration file.</para>

	<para><literal>nmbd</literal> 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 server, creating a 
	database from name registration requests that it receives and 
	replying to queries from clients for these names.</para>

	<para>In addition, <literal>nmbd</literal> 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.</para>
</refsect1>

<refsect1>
	<title>OPTIONS</title>

	<variablelist>
		<varlistentry>
		<term>-D</term>
		<listitem><para>If specified, this parameter causes 
		<literal>nmbd</literal> to operate as a daemon. That is, 
		it detaches itself and runs in the background, fielding 
		requests on the appropriate port. By default, <literal>nmbd</literal> 
		will operate as a daemon if launched from a command shell. 
		nmbd can also be operated from the <literal>inetd</literal> 
		meta-daemon, although this is not recommended.
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>-F</term>
		<listitem><para>If specified, this parameter causes
		the main <literal>nmbd</literal> process to not daemonize,
		i.e. double-fork and disassociate with the terminal.
		Child processes are still created as normal to service
		each connection request, but the main process does not
		exit. This operation mode is suitable for running
		<literal>nmbd</literal> under process supervisors such
		as <literal>supervise</literal> and <literal>svscan</literal>
		from Daniel J. Bernstein's <literal>daemontools</literal>
		package, or the AIX process monitor.
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>-S</term>
		<listitem><para>If specified, this parameter causes
		<literal>nmbd</literal> to log to standard output rather
		than a file.</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>-i</term>
		<listitem><para>If this parameter is specified it causes the
		server to run "interactively", 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. <literal>nmbd</literal> also logs to standard
		output, as if the <constant>-S</constant> parameter had been
		given. </para></listitem>
		</varlistentry>

		
<varlistentry>
<term>-h|--help</term>
<listitem><para>Print a summary of command line options.
</para></listitem>
</varlistentry>
		
		<varlistentry>
		<term>-H &lt;filename&gt;</term>
		<listitem><para>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 <link xmlns:xlink="http://www.w3.org/1999/xlink" linkend="NAMERESOLVEORDER" xlink:href="smb.conf.5.html#NAMERESOLVEORDER">name resolve order</link> described in <citerefentry><refentrytitle>smb.conf</refentrytitle>
		<manvolnum>5</manvolnum></citerefentry> to resolve any 
		NetBIOS name queries needed by the server. Note 
		that the contents of this file are <emphasis>NOT</emphasis> 
		used by <literal>nmbd</literal> to answer any name queries. 
		Adding a line to this file affects name NetBIOS resolution 
		from this host <emphasis>ONLY</emphasis>.</para>

		<para>The default path to this file is compiled into 
		Samba as part of the build process. Common defaults 
		are <filename moreinfo="none">/usr/local/samba/lib/lmhosts</filename>,
		<filename moreinfo="none">/usr/samba/lib/lmhosts</filename> or
		<filename moreinfo="none">/etc/samba/lmhosts</filename>. See the <citerefentry><refentrytitle>lmhosts</refentrytitle>
	<manvolnum>5</manvolnum></citerefentry> man page for details on the contents of this file.</para></listitem>
		</varlistentry>

		
<varlistentry>
<term>-d|--debuglevel=level</term>
<listitem>
<para><replaceable>level</replaceable> is an integer 
from 0 to 10. The default value if this parameter is 
not specified is 0.</para>

<para>The higher this value, the more detail will be 
logged to the log files about the activities of the 
server. At level 0, only critical 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.</para>

<para>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.</para>

<para>Note that specifying this parameter here will 
override the <link xmlns:xlink="http://www.w3.org/1999/xlink" linkend="LOGLEVEL" xlink:href="smb.conf.5.html#LOGLEVEL">log level</link> parameter
in the <filename moreinfo="none">smb.conf</filename> file.</para>
</listitem>
</varlistentry>
		

<varlistentry>
<term>-V</term>
<listitem><para>Prints the program version number.
</para></listitem>
</varlistentry>

<varlistentry>
<term>-s &lt;configuration file&gt;</term>
<listitem><para>The file specified contains the 
configuration details required by the server.  The 
information in this file includes server-specific
information such as what printcap file to use, as well 
as descriptions of all the services that the server is 
to provide. See <filename moreinfo="none">smb.conf</filename> for more information.
The default configuration file name is determined at 
compile time.</para></listitem>
</varlistentry>

<varlistentry>
<term>-l|--log-basename=logdirectory</term>
<listitem><para>Base directory name for log/debug files. The extension
<constant>".progname"</constant> will be appended (e.g. log.smbclient, 
log.smbd, etc...). The log file is never removed by the client.
</para></listitem>
</varlistentry>

		
		<varlistentry>
		<term>-p &lt;UDP port number&gt;</term>
		<listitem><para>UDP port number is a positive integer value.
		This option changes the default UDP port number (normally 137)
		that <literal>nmbd</literal> responds to name queries on. Don't
		use this option unless you are an expert, in which case you
		won't need help!</para></listitem>
		</varlistentry>

	</variablelist>
</refsect1>

<refsect1>
	<title>FILES</title>

	<variablelist>
		<varlistentry>
		<term><filename moreinfo="none">/etc/inetd.conf</filename></term>
		<listitem><para>If the server is to be run by the
		<literal>inetd</literal> meta-daemon, this file
		must contain suitable startup information for the
		meta-daemon. 
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term><filename moreinfo="none">/etc/rc</filename></term>
		<listitem><para>or whatever initialization script your
		system uses).</para>

		<para>If running the server as a daemon at startup,
		this file will need to contain an appropriate startup
		sequence for the server.</para></listitem>
		</varlistentry>

		<varlistentry>
		<term><filename moreinfo="none">/etc/services</filename></term>
		<listitem><para>If running the server via the
		meta-daemon <literal>inetd</literal>, 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).
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term><filename moreinfo="none">/usr/local/samba/lib/smb.conf</filename></term>
		<listitem><para>This is the default location of 
		the <citerefentry><refentrytitle>smb.conf</refentrytitle>
		<manvolnum>5</manvolnum></citerefentry> server
		configuration file. Other common places that systems
		install this file are <filename moreinfo="none">/usr/samba/lib/smb.conf</filename>
		and <filename moreinfo="none">/etc/samba/smb.conf</filename>.</para>

		<para>When run as a WINS server (see the
			<link xmlns:xlink="http://www.w3.org/1999/xlink" linkend="WINSSUPPORT" xlink:href="smb.conf.5.html#WINSSUPPORT">wins support</link>
		parameter in the <citerefentry><refentrytitle>smb.conf</refentrytitle>
		<manvolnum>5</manvolnum></citerefentry> man page),
		<literal>nmbd</literal>
		will store the WINS database in the file <filename moreinfo="none">wins.dat</filename>
		in the <filename moreinfo="none">var/locks</filename> directory configured under
		wherever Samba was configured to install itself.</para>

		<para>If <literal>nmbd</literal> is acting as a <emphasis>
				browse master</emphasis> (see the <link xmlns:xlink="http://www.w3.org/1999/xlink" linkend="LOCALMASTER" xlink:href="smb.conf.5.html#LOCALMASTER">local master</link>
		parameter in the <citerefentry><refentrytitle>smb.conf</refentrytitle>
	<manvolnum>5</manvolnum></citerefentry> man page, <literal>nmbd</literal>
		will store the browsing database in the file <filename moreinfo="none">browse.dat
		</filename> in the <filename moreinfo="none">var/locks</filename> directory
		configured under wherever Samba was configured to install itself.
		</para></listitem>
		</varlistentry>
	</variablelist>
</refsect1>

<refsect1>
	<title>SIGNALS</title>

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

	<para><literal>nmbd</literal> will accept SIGHUP, which will cause
	it to dump out its namelists into the file <filename moreinfo="none">namelist.debug
	</filename> in the <filename moreinfo="none">/usr/local/samba/var/locks</filename>
	directory (or the <filename moreinfo="none">var/locks</filename> directory configured
	under wherever Samba was configured to install itself). This will also
	cause <literal>nmbd</literal> to dump out its server database in
	the <filename moreinfo="none">log.nmb</filename> file.</para>

	<para>The debug log level of nmbd may be raised or lowered
	using <citerefentry><refentrytitle>smbcontrol</refentrytitle>
	<manvolnum>1</manvolnum></citerefentry> (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.</para>
</refsect1>


<refsect1>
	<title>VERSION</title>

	<para>This man page is correct for version 3 of 
	the Samba suite.</para>
</refsect1>

<refsect1>
	<title>SEE ALSO</title>
	<para>
	<citerefentry><refentrytitle>inetd</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>smbd</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>smb.conf</refentrytitle>
	<manvolnum>5</manvolnum></citerefentry>, <citerefentry><refentrytitle>smbclient</refentrytitle>
	<manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>testparm</refentrytitle>
	<manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>testprns</refentrytitle>
	<manvolnum>1</manvolnum></citerefentry>, and the Internet 
	RFC's <filename moreinfo="none">rfc1001.txt</filename>, <filename moreinfo="none">rfc1002.txt</filename>. 
	In addition the CIFS (formerly SMB) specification is available 
	as a link from the Web page <ulink noescape="1" url="http://samba.org/cifs/"> 
	http://samba.org/cifs/</ulink>.</para>
</refsect1>

<refsect1>
	<title>AUTHOR</title>
	
	<para>The original Samba software and related utilities 
	were created by Andrew Tridgell. Samba is now developed
	by the Samba Team as an Open Source project similar 
	to the way the Linux kernel is developed.</para>
	
	<para>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 <ulink url="ftp://ftp.icce.rug.nl/pub/unix/">
	ftp://ftp.icce.rug.nl/pub/unix/</ulink>) and updated 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 DocBook
	XML 4.2 for Samba 3.0 was done by Alexander Bokovoy.</para>
</refsect1>

</refentry>