In Gateway mode, your internet provider's RJ-45 is connected to WAN port of APO300.
Internet provider WAN setting can have Static IP, PPPoE, or DHCP accordingly select
option. Then configure the wireless parameters as per your choice of SSID, Channel
width, Encryption and Time reboot if required.
Fig 2.1.1 Gateway mode of AirONE APO300
Fig 2.1.2 Gateway mode WAN Setting of AirONE APO300