The question is not phrased very well but bear with me here, I have zero experience in network talk.
At home we have a D-link modem/router but my brother decided it would a good idea to turn on AP isolation meaning devices can’t talk to each other, which is not very good for me because I have a linux machine with all my media and bulk storage that I want offload storage and downloading things to so I dug up an old Huawei router that I want setup in the following way:
It (the Huawei box) connects to the main box (D-link) to get internet access and then my linux box and any other devices I might have connect to the Huawei box in a way that they would be able to talk to each other in a sort off subnet thing without ever talking to the D-link router meaning it would be inaccessible from my devices.
The D-link router is a DSL-2750U and it has 4 ports marked LAN and 1 marked WAN, the Huawei is an HG532s and has 4 marked LAN. I have zero control over the D-link router and full control on everything else.
It would much help if someone could guide me through setting this thing up.