D-Link DSL-2640U Quick Installation Manual page 23

DSL-2640U Quick Installation Guide
10. For connection of IPv6 PPPoE or PPPoE Dual Stack type: in the PPP
section, enter authorization data provided by your ISP (the username
(login) in the Username field and the password in the Password and
Password confirmation fields), or select the Without authorization
checkbox if authorization is not required. If you need to specify the
gateway address manually, in the IPv6 gateway section, deselect the
SLAAC checkbox and fill in the Static IPv6 gateway address field.
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