With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swL3Ipv6AddressCtrlValidLifeTime
Switch L3 Ipv6 Address Control Valid Life Time
1.3.6.1.4.1.171.11.70.5.3.2.1.5.1.5
Indicates the number of seconds that an address, based on the specified prefix, using the stateless address configuration, remains valid. For an infinite valid lifetime, the value can be set to 0xffffffff.
Back to DES3627-SWL3MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swL3Ipv6AddressCtrlValidLifeTime 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 routers right now.