I found the solution on another subject, you have to enter DNS like those of google for example in DHCP or like me on my DHCP server of my NAS. I do not find this normal, on a router your competitor...

Model : Hardware Version : Firmware Version : ISP : Hello I have a router 4G Tp-link MR6400 and I have a problem. When I set up a PC or a server in fixed IP I no longer have internet access. In DHCP...