With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swRadiusAcctUpdateInterval
Switch Radius Accounting Update Interval
1.3.6.1.4.1.171.12.3.4.1
Time interval after which this Radius record should be updated and sent to an accounting server.
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IPHost Network monitor allows you to monitor swRadiusAcctUpdateInterval on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link switches right now.