With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
tokenRingMLHistoryIndex
token Ring ML History Index
1.3.6.1.2.1.16.2.3.1.1
The history of which this entry is a part. The history identified by a particular value of this index is the same history as identified by the same value of historyControlIndex.
Back to TOKEN-RING-RMON-MIB MIB page.
IPHost Network monitor allows you to monitor tokenRingMLHistoryIndex 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.