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An easy way to separate my desktop PC from my wireless devices?

At the moment I have an ISP-provided wireless router and my PC is connected to it via an ethernet cable.

For security reasons, I’d like to separate my PC from my (and my guests’) wireless devices. Unfortunately, my router has no “guest network” feature.

As far as I understand, there are at least two ways to make sure my PC won’t be reachable from the wireless devices:

  1. Get a new router (with the “guest network” feature).
  2. Get a managed switch (to create a VLAN).

But since my PC doesn’t have to talk to any other device, I thought maybe there is an easier way?