D-Link AC3150 User Manual page 93

Section 4 - Configuration
Enable
Check to enable the Automatic IPv6 Address Assignment feature.
Automatic
IPv6 Address
Assignment:
Auto Select Stateful (DHCPv6), SLAAC + RDNSS or SLAAC + Stateless
Configuration DHCPv6
Type:
Router Enter the IPv6 address lifetime (in minutes).
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Lifetime:
Click Save when you are done.
D-Link DIR-885L User Manual 89