All that is the past with the airport extreme. I disabled the dhcp server of my Livebox. I plugged a lan cable of my Livebox to the WAN port of the airport extreme, then I put the airport extreme in DHCP mode only giving it a static IP 192.168.1.2, I entered the beach IP from the DHCP server of 192.168.1.3 to 192.168.1.200 to airport
There you go!
Livebox not crash, no need to switch it back. More problem with the Apple TV, browsing youtube by Apple TV is much more fluid, and the waiting time was divided by 5.
The network is stable and internet browsing is much more responsive. I gained 15-20% faster on the display of web pages. It's always taken ca.