GL-INET GL-MT300N-V2 Series - Cable

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2.1. Cable
Connect the router to the modem or main router via Ethernet cable to access the
Internet.
Before plugging the Ethernet cable into the WAN port of the router, you can click
Use as LAN to set the WAN port as a LAN port. That is useful when you are using
the router as a repeater. As a result, you can have one more LAN port.