Desktop connected to Modem which cant see Chromecast from Deco (Deco also connected to modem)
I live in an apartment and our internet comes from our ISP and into a modem, the modem used to have wifi which i disabled since it was sh*t. My Deco is connected to the Modem where it gets its connection from. My Desktop is also connected to the modem where it gets its connection from a different port in the Modem. My TV and Chromecast connect to the wifi of the Deco, but my Desktop cant find these. Is there a way to make that work? Only solution i have is to get a switch and use second port in Deco to switch and to Desktop, but i dont know if there is some smart Port-forwarding or redirecting that can solve this :)
Here is my setup. (https://i.imgur.com/2n2qtEo.png)