NetBIOS over TCP/IP client used to lookup NetBIOS names
nmblookup [-M] [-R]
[-S] [-r] [-A] [-h]
[-B <broadcast address>]
[-U <unicast address>]
[-d <debug level>]
[-s <smb config file>]
[-i <NetBIOS scope>] [-T]
add an example, a script, a trick and tips
nmblookup can be used to query a WINS
server (in the same way nslookup is used to query DNS servers).
To query a WINS server, nmblookup must be called like
nmblookup -U server -R
For example, running :
nmblookup -U samba.org -R
would query the WINS server samba.org for
the domain master browser (1B name type) for the IRIX
This tool is
part of the samba(7) suite.
used to query NetBIOS names and map them to IP addresses in
a network using NetBIOS over TCP/IP queries. The options
allow the name queries to be directed at a particular IP
broadcast area or to a particular machine. All queries are
done over UDP.
Searches for a master browser
by looking up the NetBIOS name name with a type of
name is "-" then it does a lookup on the
special name __MSBROWSE__. Please note that in order
to use the name "-", you need to make sure
"-" isn´t parsed as an argument, e.g.
use : nmblookup -M -- -.
Set the recursion desired bit
in the packet to do a recursive lookup. This is used when
sending a name query to a machine running a WINS server and
the user wishes to query the names in the WINS server. If
this bit is unset the normal (broadcast responding) NetBIOS
processing code on a machine is used instead. See RFC1001,
RFC1002 for details.
Once the name query has
returned an IP address then do a node status query as well.
A node status query returns the NetBIOS names registered by
Try and bind to UDP port 137 to
send and receive UDP datagrams. The reason for this option
is a bug in Windows 95 where it ignores the source port of
the requesting packet and only replies to UDP port 137.
Unfortunately, on most UNIX systems root privilege is needed
to bind to this port, and in addition, if the nmbd(8)
daemon is running on this machine it also binds to this
Interpret name as an IP
Address and do a node status query on this address.
<primary NetBIOS name>
This option allows you to
override the NetBIOS name that Samba uses for itself. This
is identical to setting the
parameter in the smb.conf file.
However, a command line setting will take precedence over
settings in smb.conf.
specifies a NetBIOS scope that nmblookup will use to
communicate with when generating NetBIOS names. For details
on the use of NetBIOS scopes, see rfc1001.txt and
rfc1002.txt. NetBIOS scopes are very rarely used,
only set this parameter if you are the system administrator
in charge of all the NetBIOS systems you communicate
SMB domain of the username. This overrides the default
domain which is the domain defined in smb.conf. If the
domain specified is the same as the servers NetBIOS name, it
causes the client to log on using the servers local SAM (as
opposed to the Domain SAM).
socket options to set on the client socket. See the socket
options parameter in the smb.conf manual page for the list
of valid options.
summary of command line options.
query to the given broadcast address. Without this option
the default behavior of nmblookup is to send the query to
the broadcast address of the network interfaces as either
auto-detected or defined in the interfaces
parameter of the smb.conf(5) file.
unicast query to the specified address or host unicast
address. This option (along with the -R
option) is needed to query a WINS server.
is an integer from 0 to 10. The default value if this
parameter is not specified is 0.
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.
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
that specifying this parameter here will override the
parameter in the smb.conf
the program version number.
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 smb.conf for more information. The
default configuration file name is determined at compile
directory name for log/debug files. The extension
".progname" will be appended (e.g.
log.smbclient, log.smbd, etc...). The log file is never
removed by the client.
causes any IP addresses found in the lookup to be looked up
via a reverse DNS lookup into a DNS name, and printed out
address .... NetBIOS name
that is the normal output.
which flags apply to the name that has been looked up.
Possible answers are zero or more of: Response,
Authoritative, Truncated, Recursion_Desired,
the NetBIOS name being queried. Depending upon the previous
options this may be a NetBIOS name or IP address. If a
NetBIOS name then the different name types may be specified
by appending ´#<type>´ to the name. This
name may also be ´*´, which will return all
registered names within a broadcast area.
This man page is correct for version 3 of
the Samba suite.
samba, and smb.conf.
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.
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 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