With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
faRegRepliesRelayed
fa Reg Replies Relayed
1.3.6.1.2.1.44.1.5.3.14
Total number of valid Registration Replies relayed to the mobile node by foreign agent.
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IPHost Network monitor allows you to monitor faRegRepliesRelayed 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.