With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmiHaRegMobilityBindingMacAddress
Cisco Mobile IP Ha Registration Mobility Binding Mac Address
1.3.6.1.4.1.9.9.174.1.2.1.2.1.8
This object represents the MAC address of Mobile Node.
Back to CISCO-MOBILE-IP-MIB MIB page.
IPHost Network monitor allows you to monitor cmiHaRegMobilityBindingMacAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.