Ensure the Ethernet cable is correctly connected between the modem and the WAN port on the router
What is the difference between a WAN port and a LAN port
Difference between LAN and WAN Port
To WAN Or To LAN: Which Port Should You Connect Your Cable To For Optimal Speed? | Open World Learning
What is a WAN Port on a Router? - YouTube
networking - Expanding wireless coverage: What are the differences between LAN to LAN and LAN to WAN when it comes to connecting two wireless routers? - Super User
What are the technical differences between WAN and LAN ports in a consumer router? - Quora
Why My TP-Link Router Can Not Get WAN Parameters From My Modem?