With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
ringStationIfIndex
ring Station If Index
1.3.6.1.2.1.16.10.2.1.1
The value of this object uniquely identifies the interface on this remote network monitoring device on which this station was detected. The interface identified by a particular value of this object is the same interface as identified by the same value of the ifIndex object, defined in MIB-II [3].
Back to TOKEN-RING-RMON-MIB MIB page.
IPHost Network monitor allows you to monitor ringStationIfIndex 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 routers right now.