With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dlswDirNBLocation
dlsw Dir NB Location
1.3.6.1.4.1.2011.2.34.4.2.2.1.6
Points to either the ifEntry, dlswTConnConfigEntry, dlswTConnOperEntry, 0.0, or something that is implementation specific. It identifies the location of the NetBIOS name or the set of NetBIOS names.
Back to DLSW-MIB MIB page.
IPHost Network monitor allows you to monitor dlswDirNBLocation on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.