With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
accountingNetworkState
accounting Network State
1.3.6.1.4.1.171.12.55.1.3
Specifies the status of the RADIUS accounting service for 802.1x port access control.
Back to RADIUS-ACCOUNTING-MIB MIB page.
IPHost Network monitor allows you to monitor accountingNetworkState 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.