nbtstat

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nbtstat

This chapter has made several references to the nbtstat command, which can be used to work with and diagnose NetBIOS over TCP/IP. This section looks at this command and the functions that you can perform using it. nbtstat is a diagnostic command that displays protocol statistics and current TCP/IP connections using NBT. The syntax is as follows:

nbtstat [-a remotename] [-A IP address] [-c] [-n] [-R] [-r] [-S] [-s] [interval]

Although some of the command-line parameters for nbtstat have already been discussed, Table 7.3 lists all the available switches.

The following an example of the output from the nbtstat command:

NetBIOS Connection Table

Local	Name	State	In/Out	Remote Host	Input	Output
TAWNI	<03>	Listening
SCRIM	<03>	Listening
TAWNI	<00>	Connected	Out	198.53.147.2	0B	174B

The preceding example does not show all the possible columns, however. The column headings generated by the nbtstat utility listed along with their meanings are as follows:

Input. The number of bytes of information that have been received.
Output. The number of bytes of information that have been sent.
In/Out. The direction in which the connection was made, with OUT to the other computer, or IN from it.
Life. The time remaining before the cache entry is purged.
Local Name. The local name used for the session.
Remote Host. The name on the remote host being used in this session.
Type. The type of name that was resolved.
State. The state of the connection. Possible states include the following:
Connected. A NetBIOS session has been established between the two hosts.
Associated. Your system has requested a connection, and has resolved the remote name to an IP address. This is an active open.
Listening. This is a service on your computer that is not being used. This is a passive open.
Idle. The service that opened the port has since paused or hung. No activity is possible until the service resumes.
Connecting. At this point, your system is attempting to create a NetBIOS session. The system is attempting to resolve the name of the remote host to an IP address.
Accepting. A service on your system has been asked to open a session, and is negotiating the session with the remote host.
Reconnecting. After a session has dropped (often due to time-out), your system is trying to reconnect.
Outbound. The TCP three-way handshake is in progress. This establishes the transport layer session that is used to establish the NetBIOS session.
Inbound. Same as outbound; however, this is a connection being made to a service on your system.
Disconnecting. The remote system has requested a session be terminated, so the session is being shut down.
Disconnected. Your system is requesting a session be terminated.

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