With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swAuthSessionAuthenticMethod
Switch Authentication Session Authentication Method
1.3.6.1.4.1.171.12.3.6.4.1.6
The authentication method used to establish the session.
Back to AUTH-MIB MIB page.
IPHost Network monitor allows you to monitor swAuthSessionAuthenticMethod 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.