With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
dvmrpRouteNextHopSource
dvmrp Route Next Hop Source
1.3.6.1.3.62.1.1.6.1.1
The network address which when combined with the corresponding value of dvmrpRouteNextHopSourceMask identifies the sources for which this entry specifies a next hop on an outgoing interface.
Back to DVMRP-MIB MIB page.
IPHost Network monitor allows you to monitor dvmrpRouteNextHopSource 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.