I found the solution!!! as I suspected the problem was the livebox! the 4 ports behind cannot be settled as you want some are for tv some can be used for internet. so i just chaned the cable to...

the weird thing is that when I am connected on the SSID "big house even if I do not see the 701ND in the Livebox admin, I can connect to it by typing 192.168.1.2 in browser and I get the interface....

I did make the ping from client side but no success

Here are the screenshots from Client Maybe I should choose a channel for wirelss instead of auto? But still no internet from Livebox to PA, so there is no chance it goes between PA and Client :(...

I go to the other house take the same screenshots on client side

jimasek wrote Maybe you give us some screenshot from those configurations ? Hi thanks for the reply! Here they are for the PA: I disabled the security for the moment.