With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swL3IpStaticRouteMask
Switch L3 Ip Static Route Mask
1.3.6.1.4.1.171.11.70.5.3.2.5.1.2
Indicate the mask to be logical-AND with the destination address before being compared to the value in the swL3IpStaticRouteDest field. For those systems that do not support arbitrary subnet masks, an agent constructs the value of the swL3IpStaticRouteMask by reference to the IP Address Class. Any assignment (implicit or otherwise) of an instance of this object to a value x must be rejected if the bitwise logical-AND of x with the value of the corresponding instance of the swL3IpStaticRouteDest object is not equal to swL3IpStaticRouteDest.
Back to DES3528-SWL3MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swL3IpStaticRouteMask 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.