With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mnRepliesHAAuthenticationFailure
mn Replies HA Authentication Failure
1.3.6.1.2.1.44.1.3.3.12
Total number of replies without a valid Home Agent to Mobile Node authenticator.
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IPHost Network monitor allows you to monitor mnRepliesHAAuthenticationFailure 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.