Finally got the solution! Last night I made all working properly!
The fact was that this new modem allows two connection mde: 2.4ghz and 5ghz. My provider set both with the same SSID and password so I didn't figured out that my macbook connected to 5 g wirelees while the printer on the 2.4 g.
When I separated the two network with different SSID and password I was able to connect both devices to the same network and got everything working!! Even my ihpone, ipad and whatsoever
Great printer by the way!
