Ensure the Ethernet cable is correctly connected between the modem and the WAN port on the router
What Does WAN Mean on My Router? (Explained) | DeviceTests
Definition of WAN port | PCMag
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Application Requirement/Choose WAN Connection Type on my TP-Link router
WAN Port on Router Explained - What is it and How to use it
Why My TP-Link Router Can Not Get WAN Parameters From My Modem?
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LAN vs WAN: Understanding the Differences and Uses
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LAN Port vs WAN Port: What's the Difference? How to Use?
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ER800 Series Cloud Management Based SD-WAN 5G Router – InHand Networks