With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swPortSecVLANMaxLernAddr
Switch Port Sec VLAN Max Lern Address
1.3.6.1.4.1.171.12.63.3.2.1.1.2
Indicates allowable number of addresses to be learned on this VLAN. A value of -1 means no-limit. The default value is no-limit. The max entry range is (0..N). The value N means the max number and is determined by the project itself.
Back to PORT-SECURITY-MIB MIB page.
IPHost Network monitor allows you to monitor swPortSecVLANMaxLernAddr 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.