With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnnEouHostQueryMacAddr
cnn Eou Host Query Mac Addr
1.3.6.1.4.1.9.9.484.1.4.7.1.6
The Mac address for the queried host. If the 'mac' option of cnnEouHostQueryMask is selected, an appropriate MAC address is assigned to this object then only the host with the specified MAC address will be containing in the result table.
Back to CISCO-NAC-NAD-MIB MIB page.
IPHost Network monitor allows you to monitor cnnEouHostQueryMacAddr 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.