With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cipSecTunHistRemoteAddr
Cisco IPSec Sec Tunnel History Remote Address
1.3.6.1.4.1.9.9.171.1.4.3.1.1.6
The IP address of the remote endpoint for the IPsec Phase-2 Tunnel.
Back to CISCO-IPSEC-FLOW-MONITOR-MIB MIB page.
IPHost Network monitor allows you to monitor cipSecTunHistRemoteAddr on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.