Asus RT-AC1200G User Manual page 16

2. The wireless router automatically detects if your ISP connection
type is Dynamic IP, PPPoE, PPTP and L2TP. 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
16