RT-AC68U supports several operation modes to meet different requirements. Please select the mode that match your situation. * In wireless router/ IP sharing mode, RT-AC68U connects to the Internet via PPPoE, DHCP, PPTP, L2TP, or Static IP and shares the wireless network to LAN clients or devices. In this mode, NAT, firewall, and DHCP server are enabled by default. UPnP and Dynamic DNS are supported for SOHO and home users. Select this mode if you are a first-time user or you are not currently using any wired/wireless routers. * In Repeater mode, RT-AC68U wirelessly connects to an existing wireless network to extend the wireless coverage. In this mode, the firewall, IP sharing, and NAT functions are disabled. * In Access Point (AP) mode, RT-AC68U connects to a wireless router through an Ethernet cable to extend the wireless signal coverage to other network clients. In this mode, the firewall, IP sharing, and NAT functions are disabled by default. * RT-AC68U can be configured in Media bridge mode.The Media Bridge mode provides the fastest 802.11ac Wi-Fi connection for multiple media devices simultaneously. To set up the Media Bridge mode, you need two RT-AC68U: one configured as the Media station and the other as a router.Configure one RT-AC68U as a router and another RT-AC68U as an 802.11ac Media bridge to provide a simultaneous 802.11ac Wi-Fi connection for your media devices such as computer, Smart TV, game console, DVR, or media player via Ethernet cable.Change to Media Bridge mode to provide a simultaneous 802.11ac Wi-Fi connection for your media devices. In media bridge mode, only wireless devices connect to the P-AP. Client devices need to be connected to the media bridge with a network cable.