With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swAuthSessionFramesRx
Switch Authentication Session Frames Rx
1.3.6.1.4.1.171.12.3.6.4.1.3
The number of user data frames received from this Mac during the session.
Back to DLINK-AUTH-MIB MIB page.
IPHost Network monitor allows you to monitor swAuthSessionFramesRx 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 VPN routers right now.