With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swL2DevCtrlTelnetState
Switch L2 Device Control Telnet State
1.3.6.1.4.1.171.11.70.5.2.1.2.14.1
This object control telnet status.
Back to DGS3612-L2MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swL2DevCtrlTelnetState 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 IP cameras right now.