NMBLOOKUP(1) User Commands NMBLOOKUP(1)

NAME

nmblookup - NetBIOS over TCP/IP client used to lookup NetBIOS names

SYNOPSIS

nmblookup [-M|--master-browser] [--recursion] [-S|--status]
[-r|--root-port] [-A|--lookup-by-ip]
[-B|--broadcast=BROADCAST-ADDRESS] [-U|--unicast=UNICAST-ADDRESS]
[-T|--translate] [-f|--flags] [-?|--help] [--usage]
[-d|--debuglevel=DEBUGLEVEL] [--debug-stdout]
[--configfile=CONFIGFILE] [--option=name=value]
[-l|--log-basename=LOGFILEBASE] [--leak-report] [--leak-report-full]
[-R|--name-resolve=NAME-RESOLVE-ORDER]
[-O|--socket-options=SOCKETOPTIONS] [-m|--max-protocol=MAXPROTOCOL]
[-n|--netbiosname=NETBIOSNAME] [--netbios-scope=SCOPE]
[-W|--workgroup=WORKGROUP] [--realm=REALM] {name}

DESCRIPTION

This tool is part of the samba(7) 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.

OPTIONS

-M|--master-browser
Searches for a master browser by looking up the NetBIOS name with
a type of 0x1d. If 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 -- -.

--recursion
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.

-S|--status
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|--root-port
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|--lookup-by-ip
Interpret name as an IP Address and do a node status query on
this address.

-B|--broadcast <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 <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.

-T|--translate
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
each

IP address .... NetBIOS name

pair that is the normal output.

-f|--flags
Show which flags apply to the name that has been looked up.
Possible answers are zero or more of: Response, Authoritative,
Truncated, Recursion_Desired, Recursion_Available, Broadcast.

name
This is 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.

-d|--debuglevel=DEBUGLEVEL
level is an integer from 0 to 10. The default value if this
parameter is not specified is 1 for client applications.

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.

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 log
level parameter in the ${prefix}/etc/smb.conf file.

--debug-stdout
This will redirect debug output to STDOUT. By default all clients
are logging to STDERR.

--configfile=<configuration file>
The file specified contains the configuration details required by
the client. The information in this file can be general for
client and server or only provide client specific like options
such as client smb encrypt. See ${prefix}/etc/smb.conf for more
information. The default configuration file name is determined at
compile time.

--option=<name>=<value>
Set the smb.conf(5) option "<name>" to value "<value>" from the
command line. This overrides compiled-in defaults and options
read from the configuration file. If a name or a value includes a
space, wrap whole --option=name=value into quotes.

-l|--log-basename=logdirectory
Base 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.

--leak-report
Enable talloc leak reporting on exit.

--leak-report-full
Enable full talloc leak reporting on exit.

-V|--version
Prints the program version number.

-R|--name-resolve=NAME-RESOLVE-ORDER
This option is used to determine what naming services and in what
order to resolve host names to IP addresses. The option takes a
space-separated string of different name resolution options. The
best ist to wrap the whole --name-resolve=NAME-RESOLVE-ORDER into
quotes.

The options are: "lmhosts", "host", "wins" and "bcast". They
cause names to be resolved as follows:

+o lmhosts: Lookup an IP address in the Samba lmhosts
file. If the line in lmhosts has no name type attached
to the NetBIOS name (see the lmhosts(5) for details)
then any name type matches for lookup.

+o host: Do a standard host name to IP address
resolution, using the system /etc/hosts, NIS, or DNS
lookups. This method of name resolution is operating
system dependent, for instance on IRIX or Solaris this
may be controlled by the /etc/nsswitch.conf file).
Note that this method is only used if the NetBIOS name
type being queried is the 0x20 (server) name type,
otherwise it is ignored.

+o wins: Query a name with the IP address listed in the
wins server parameter. If no WINS server has been
specified this method will be ignored.

+o bcast: Do a broadcast on each of the known local
interfaces listed in the interfaces parameter. This is
the least reliable of the name resolution methods as
it depends on the target host being on a locally
connected subnet.

If this parameter is not set then the name resolve order defined
in the ${prefix}/etc/smb.conf file parameter (name resolve order)
will be used.

The default order is lmhosts, host, wins, bcast. Without this
parameter or any entry in the name resolve order parameter of the
${prefix}/etc/smb.conf file, the name resolution methods will be
attempted in this order.

-O|--socket-options=SOCKETOPTIONS
TCP socket options to set on the client socket. See the socket
options parameter in the ${prefix}/etc/smb.conf manual page for
the list of valid options.

-m|--max-protocol=MAXPROTOCOL
The value of the parameter (a string) is the highest protocol
level that will be supported by the client.

Note that specifying this parameter here will override the client
max protocol parameter in the ${prefix}/etc/smb.conf file.

-n|--netbiosname=NETBIOSNAME
This option allows you to override the NetBIOS name that Samba
uses for itself. This is identical to setting the netbios name
parameter in the ${prefix}/etc/smb.conf file. However, a command
line setting will take precedence over settings in
${prefix}/etc/smb.conf.

--netbios-scope=SCOPE
This 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 with.

-W|--workgroup=WORKGROUP
Set the 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).

Note that specifying this parameter here will override the
workgroup parameter in the ${prefix}/etc/smb.conf file.

-r|--realm=REALM
Set the realm for the domain.

Note that specifying this parameter here will override the realm
parameter in the ${prefix}/etc/smb.conf file.

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

--usage
Display brief usage message.

EXAMPLES

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.

VERSION

This man page is part of version 4.18.11 of the Samba suite.

SEE ALSO

nmbd(8), samba(7), and smb.conf(5).

AUTHOR

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.

Samba 4.18.11 03/13/2024 NMBLOOKUP(1)