With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
agentBscSwFileCtrlUnitID
agent Bsc Software File Control Unit ID
1.3.6.1.4.1.171.12.1.2.1.1.11
Specifies which unit of the switch stack the firmware image will be downloaded from. One or more units can be set to this list. Each bit from left to right represents the switch from unit ID 1 to unit ID 12. A null entry in this field denotes all switches in the switch stack.
Back to AGENT-GENERAL-MIB MIB page.
IPHost Network monitor allows you to monitor agentBscSwFileCtrlUnitID 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.