With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvpdnSessionRemoteId
cvpdn Session Remote Id
1.3.6.1.4.1.9.10.51.1.2.1.1.1
The remote end ID of an active VPN tunnel user session.
Back to CISCO-VPDN-MGMT-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cvpdnSessionRemoteId 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.