With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mnRegRepliesRecieved
mn Reg Replies Recieved
1.3.6.1.2.1.44.1.3.3.4
Total number of registration replies received by the mobile node in which the Lifetime is greater than zero.
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IPHost Network monitor allows you to monitor mnRegRepliesRecieved 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.