nmblookup

Name

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

Synopsis

nmblookup [-M] [-R] [-S] [-r] [-A] [-h] [-B <broadcast address>] [-U <unicast address>] [-d <debug level>] [-s <smb config file>] [-i <NetBIOS scope>] [-T] [-f] {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

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__. 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 -- -.

-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 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

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 this address.

-n <primary NetBIOS name>

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.

-i <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=domain

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).

-O socket options

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.

-h|--help

Print a summary of command line options. -

-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.

-V

Prints the program version number. -

-s <configuration file>

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.

-d|--debug=debuglevel

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 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.

-l|--logfile=logbasename

File name for log/debug files. The extension -".client" will be appended. The log file is -never removed by the client. -

-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 each

IP address .... NetBIOS name

pair that is the normal output.

-f

- 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.

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 correct for version 3.0 of - the Samba suite.

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.

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/) 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 Bokovoy.