With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
agentTrustedHostIPv6PrefixLen
agent Trusted Host I Pv6 Prefix Len
1.3.6.1.4.1.171.12.1.2.10.1.1.13
Specifies the IPv6 prefix length of the IPv6 trusted host.
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IPHost Network monitor allows you to monitor agentTrustedHostIPv6PrefixLen 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 WiFi routers right now.