With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
tokenRingMLHistoryActiveStations
token Ring ML History Active Stations
1.3.6.1.2.1.16.2.3.1.27
The maximum number of active stations on the ring detected by the probe during this sampling interval.
Back to TOKEN-RING-RMON-MIB MIB page.
IPHost Network monitor allows you to monitor tokenRingMLHistoryActiveStations 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 access points right now.