With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
dvmrpReachableRoutes
dvmrp Reachable Routes
1.3.6.1.3.62.1.1.10
The number of entries in the routing table with non infinite metrics. This can be used to detect network partitions by observing the ratio of reachable routes to total routes.
Back to DVMRP-MIB MIB page.
IPHost Network monitor allows you to monitor dvmrpReachableRoutes 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 access points right now.