With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swQinQRuleSrcIPv4AddrMask
Switch Qin Q Rule Source I Pv4 Address Mask
1.3.6.1.4.1.171.12.57.4.2.1.8
Specifies the IPv4 source address mask.
Back to Q-IN-Q-MIB MIB page.
IPHost Network monitor allows you to monitor swQinQRuleSrcIPv4AddrMask 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.