nmblookup — NetBIOS over TCP/IP client used to lookup NetBIOS names
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}
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.
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 -- -
.
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 a host.
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.
Interpret name
as
an IP Address and do a node status query on this 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.
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.
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.
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.
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.
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
smb.conf
file.
This will redirect debug output to STDOUT. By default all clients are logging to STDERR.
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
smb.conf
for more information. The default
configuration file name is determined at compile time.
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.
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.
Enable talloc leak reporting on exit.
Enable full talloc leak reporting on exit.
Prints the program version number.
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:
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.
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.
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.
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 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 smb.conf
file, the name resolution methods
will be attempted in this order.
TCP 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.
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 smb.conf
file.
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 smb.conf
file. However, a command
line setting will take precedence over settings in
smb.conf
.
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.
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
smb.conf
file.
Set the realm for the domain.
Note that specifying this parameter here will override
the realm parameter in the
smb.conf
file.
Print a summary of command line options.
Display brief usage message.
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.