D-Link DIR-821 User Manual page 50

Section 4 - Configuration
Local Connectivity Only allows you to set up an IPv6 connection that will not connect to the Internet.
Enable ULA:
Click here to enable Unique Local IPv6 Unicast Addresses settings.
Use Default
Checking this box will automatically configure the ULA prefix for
ULA Prefix: the default setting.
ULA Prefix: If you wish to choose your own ULA prefix, enter it here.
Current IPv6 This section will display the current settings for your IPv6 ULA.
ULA Settings:
Click Save when you are done.
D-Link DIR-821 User Manual
Local Connectivity Only
46