With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swDHCPServerPingPktNumber
Switch DHCP Server Ping Packet Number
1.3.6.1.4.1.171.12.38.1.2
This object specifies the number of ping packets the DHCP server sends to an IP address before assigning this address to a requesting client.
Back to DHCP-Server-MIB MIB page.
IPHost Network monitor allows you to monitor swDHCPServerPingPktNumber 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.