Routing mode: realize the router function, connect the WAN port to the modem
(ADSL modem or fiber optic modem) dial-up Internet access or WAN port dynamic,
static IP address Internet access.
Relay mode: In this mode, it usually refers to a one-to-one situation. The wireless
CPE at both ends of the bridge only communicates with the opposite wireless CPE
at the other end. The device can add the other party's MAC address by scanning the
available network. The encryption methods of both parties must be consistent.