D-Link DIR-300S Quick Installation Manual page 23

DIR-300S Quick Installation Guide
14. For connection of PPPoE + Dynamic IP type: if your ISP has provided
the address of the DNS server, in the IP section, deselect the Obtain
DNS server addresses automatically checkbox and fill in the
Primary DNS server field. Then 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.
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