D-Link DSL-3580L Series User Manual page 57

Section 3 - Configuration
SLAAC+RDNSS to set computers on Router network obtained IPv6
address by RDNSS
Stateful DHCP to set computers on Router network obtained IPv6
address by Stateful DHCP, you need type the IPv6 Address Range (Start
and End)
IPv6 Connection Type: DS-Lite
Choose DS-Lite DHCPv6 Option, If you choose Manual Configuration,
need type the AFTR IPv6 Address.
Type B4 IPv4 Address (if necessarily)
Type WAN IPv6 Address and IPv6 WAN Default Gateway.
D-Link DSL-3580L Series User Manual 57