With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ceipSecTunSaInPkts
Cisco Enhanced IP Sec Tunnel Security Association In Packets
1.3.6.1.4.1.9.9.432.1.1.5.1.8
The total number of packets received by using this SA.
Back to CISCO-ENHANCED-IPSEC-FLOW-MIB MIB page.
IPHost Network monitor allows you to monitor ceipSecTunSaInPkts 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.