nmblookup — NetBIOS over TCP/IP client used to lookup NetBIOS names
nmblookup
[-M|--master-browser] [-R|--recursion] [-S|--status] [-r|--root-port] [-A|--lookup-by-ip] [-B|--broadcast <broadcast address>] [-U|--unicast <unicast address>] [-d <debug level>] [-s <smb config file>] [-i <NetBIOS scope>] [-T|--translate] [-f|--flags] {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.
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).
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.
Print a summary of command line options.
Display brief usage message.
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.
level
is an integer
from 0 to 10. The default value if this parameter is
not specified is 0.
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.
Prints the program version number.
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 smb.conf
for more information.
The default configuration file name is determined at
compile time.
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.
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.
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.
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.