Network / Sharing :: How To Hide Some Devices From Home Network

Is there a way to hide devices connected to LAN port 4 on a modem-router from devices connected to the other 3 ports? And also in the other direction: hide all devices on ports 1 2 3 from anything attached to port 4 ?

Instead of specifying by LAN port, the white list of things to see each other could be selected by MAC address, as I only have three things I want to see and be seen on my home network. A black list system is no good because unknown new things might get connected to LAN port 4.

I have an unusual networking situation... I disabled wireless in my modem-router, so only the 4 ethernet ports work.

I have a desktop (Win 7) a laptop (Win 8.1) and a NAS connected to the router's ports 1 and 2 and 3. They are networked by a password protected homegroup.

I share my internet service with a friend in the next apartment, by one ethernet cable attached to port 4 on my modem-router. Now her friends are staying there while she is away for a few months. They are not easy to negotiate with and I can't ask them to make any changes to their computers.

It seems they have added some kind of switch or hub at their end of that one cable, because I often see two or more strange PCs listed in Windows Explorer networks folder. It even lists the 3 usernames on their PCs.

I shouldn't simply disconnect their ethernet cable, or they won't have internet access, but I don't like how their PCs show up in Windows Explorer. Also I guess my three devices are shown on their computers (but probably none of my folders are actually readable by them)

It seems "network discovery" is not selective about what devices it finds. It is simply on or off, and it must stay on for my homegroup network to work.

Should I try a different kind of networking in Windows, instead of a homegroup?