With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
agentMibCapabilityTable
agent Mib Capability Table
1.3.6.1.4.1.171.12.1.1.2
A list of MIB capability entries supported by this agent.
Back to AGENT-MIB MIB page.
IPHost Network monitor allows you to monitor agentMibCapabilityTable 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.