TP-LINK MESH Networking Strange Problem: WAN port shows no network cable, but can I access the Internet normally?

tell you something, has anyone encountered a strange situation after using TP-LINK routers for MESH networking? Even though all devices can access the Internet normally, whether they log in to the APP or the web management background, it will display "No network cable connection at the WAN port". I encountered this problem before, and I was quite panicked at first, but later I found that I didn't have to worry about it at all, and it was useless to restart, probably a small bug in the router.

the reason is simple, it is because I turned off the DHCP server of the TP-LINK router. Why should it be closed? Because in addition to the optical cat, my family also connected to the switch (or soft router), and I wanted the switch/soft router to be responsible for assigning IP addresses to the devices at home, so I turned off the DHCP of the router.

to popularize the DHCP server with you: it is like an "IP assigner", which can automatically assign necessary network parameters such as IP addresses and subnet masks to devices connected to the LAN (such as mobile phones and computers). The TP-LINK router's DHCP has three states: on, off, and automatic. If you choose "Automatic", if the router has the WDS function turned on, it will automatically detect whether there are other DHCP servers in the local area network, and if there is, it will turn off itself to avoid conflicts~

So when you encounter this situation of "WAN port has no network cable connection but can access the Internet", first think about whether you have turned off DHCP, if so, don't worry about that prompt, it won't affect the use!