Asus RT-AC68U - Manual (Page 16)

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2. The wireless router automatically detects if your ISP connection
type is Dynamic IP, PPPoE, PPTP, L2TP, and Static IP. Key in
the necessary information for your ISP connection type.
IMPORTANT! Obtain the necessary information from your ISP about
the Internet connection type.
for Automatic IP (DHCP)
for PPPoE, PPTP, and L2TP