Figure 7: Ipv6 Lan And Dhcpv6 Configuration - D-Link DWC-1000 User Manual

Wireless Controller
Figure 7: IPv6 LAN and DHCPv 6 configuration
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If you change the IP address and click Save Settings, the GUI will not
respond. Open a new connection to the new IP address and log in again. Be
sure the LAN host (the machine used to manage the router) has obtained IP
address from newly assigned pool (or has a static IP address in the router's
LAN subnet) before accessing the router via changed IP address.
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User Manual