With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMacBasedAuthInfoAgingTime
sw Mac Based Authorization Info Aging Time
This object indicates the remaining time until the authenticated client returns to an unauthenticated state. -1 will be displayed before the port or MAC address passes authentication. 0 will be displayed when the aging time is set to infinite on the port. -2 indicates the host aging timeout, but MAC-based Access Control will hold this entry for expired (for stacking performance), after the time has expired, then the switch will delete it.
Back to Mac-Based-Authentication-MIB MIB page.
IPHost Network monitor allows you to monitor swMacBasedAuthInfoAgingTime 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 switches right now.