With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swDHCPLocalRelayVlanID
Switch DHCP Local Relay Vlan ID
1.3.6.1.4.1.171.12.42.4.2.1.1
This object indicates the VLAN ID.
Back to DHCP-RELAY-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swDHCPLocalRelayVlanID 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.
