@Tony I changed the subnet mask to 255.255.255.0. I then rebooted the router. I tried letting the ESP32 device get IP address from DHCP, and also setting a static address outside the pool. It always...

Update: We can add one more chip with the same problem: ESP-32, also from Espressif. The model I am using is based on the module ESP32-S by AI-Thinker.

@Tony Two models actually, ESP-01 and NodeMCU 1.0, both based on ESP8266, same problem. I get dynamic IP address from the internet provider. Under Advanced, LAN, the subnet mask is Custom:...

I am having trouble connecting Ethernet-connected computers to a certain Wi-Fi device based on the ESP8266 Wi-Fi chip by Espressif. The connection works only when the computer is connected via Wi-Fi...