Also, the only way to access to the TP LINK is router is via TP-Link wifi

@Mala116 The purpose is to extend the wifi of my root router My ISP router address is 192.168.1.1 and SSID is SFR_E19F MY C6 ROUTER IS 192.168.0.1 AND SSID is TP-LINK_859 Routers are RJ45 wire...

Hi, I can't change LAN IP Address in Advanced menu Network LAN ! Message "WAN IP ADDRESS AND LAN IP ADDRESS CANNOT BE IN THE SAME SUBNET" please help thanks