This monitor tests the NetBIOS over TCP/IP name resolution in Microsoft Windows environments. The monitor tries to retrieve a NetBIOS name for the IP address of the interface. Name services for NetBIOS in Microsoft Windows are provided on port 137/UDP or 137/TCP.

The service uses the IP address of the interface where the monitor is assigned. The service is up for the given IP address if a NetBIOS name is registered and can be resolved.

For troubleshooting, refer to the use of the Microsoft Windows command line tool nbtstat or on Linux nmblookup.

Microsoft has deprecated the use of NetBIOS. Since Windows Server 2000, DNS is used as the default name resolution.
If you want to monitor the status of a Windows file server, check out the JCifsMonitor.

Monitor facts

Class Name


Configuration and use

Table 1. Optional monitor-specific parameter for the SmbMonitor
Parameter Description Default


Try to get the NetBIOS node status type for the given address.


This monitor implements the Common Configuration Parameters.


Sample configuration on how to configure the monitor in poller-configuration.xml.

<service name="SMB" interval="300000" user-defined="false" status="on">
  <parameter key="retry" value="1"/>
  <parameter key="timeout" value="3000"/>

<monitor service="SMB" class-name="org.opennms.netmgt.poller.monitors.SmbMonitor"/>