nmblookup - NetBIOS over TCP/IP client used to lookup NetBIOS names
nmblookup [ -f ] [ -M ] [ -R ] [ -S ] [ -r ] [ -A ] [ -h ] [ -B
<broadcast address> ] [ -U <unicast address> ] [ -d <debug level> ]
[ -s <smb config file> ] [ -i <NetBIOS scope> ] [ -T ] name
This tool is part of the Samba suite.
nmblookup is 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.
-f Causes nmblookup to print out the flags in the NMB packet head-
ers. These flags will print out as strings like Authoritative,
Recursion_Desired, Recursion_available, etc.
-M Searches for a master browser by looking up the NetBIOS name
name with a type of 0x1d. If name is "-" then it does a lookup
on the special name __MSBROWSE__.
-R Set the recursion desired bit in the packet to do a recursive
lookup. This is used when sending a name query to a machine run-
ning a WINS server and the user wishes to query the names in the
WINS server. If this bit is unset the normal (broadcast respond-
ing) NetBIOS processing code on a machine is used instead. See
rfc1001, rfc1002 for details.
-S 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 a host.
-r 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 port.
-A Interpret name as an IP Address and do a node status query on
-h Print a help (usage) message.
-B <broadcast address>
Send the 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.
-U <unicast address>
Do a unicast query to the specified address or host unicast
address. This option (along with the -R option) is needed to
query a WINS server.
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 about the
activities of nmblookup. At level 0, only critical errors and
serious warnings will be logged.
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 data, most of which is extremely cryptic.
Note that specifying this parameter here will override the log
level parameter in the smb.conf(5) file.
This parameter specifies the pathname to the Samba configuration
file, smb.conf(5) This file controls all aspects of the Samba
setup on the machine.
This specifies a NetBIOS scope that nmblookup will use to commu-
nicate 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 with.
-T This causes any IP addresses found in the lookup to be looked up
via a reverse DNS lookup into a DNS name, and printed out before
IP address .... NetBIOS name
pair that is the normal output.
name This is the NetBIOS name being queried. Depending upon the pre-
vious 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.
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 this:
nmblookup -U server -R 'name'
For example, running :
nmblookup -U samba.org -R 'IRIX#1B'
would query the WINS server samba.org for the domain master browser (1B
name type) for the IRIX workgroup.
This man page is correct for version 2.2 of the Samba suite.
nmbd(8) samba(7) and smb.conf(5)
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.
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/
<URL: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
19 November 2002 NMBLOOKUP(1)