With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cikeTunInDropPkts
Cisco IKE Tunnel In Dropped Packets
1.3.6.1.4.1.9.9.171.1.2.3.1.21
The total number of packets dropped by this IPsec Phase-1 IKE Tunnel during receive processing.
Back to CISCO-IPSEC-FLOW-MONITOR-MIB MIB page.
IPHost Network monitor allows you to monitor cikeTunInDropPkts on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.