With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
tokenRingMLHistorySampleIndex
token Ring ML History Sample Index
1.3.6.1.2.1.16.2.3.1.2
An index that uniquely identifies the particular Mac-Layer sample this entry represents among all Mac-Layer samples associated with the same historyControlEntry. This index starts at 1 and increases by one as each new sample is taken.
Back to TOKEN-RING-RMON-MIB MIB page.
IPHost Network monitor allows you to monitor tokenRingMLHistorySampleIndex 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.