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My roommate asked me to share my internet connection with him for his company laptop. I have the option to give him wireless (WiFi credentials) and wired access (ethernet).

If I do decide to share,

  1. Should I go for wired or wireless? (Speed and coverage area are not an issue yet.)
  2. What are the things his company IT could know about and access from my network and what can they exploit?
  3. What are the measures I can take to protect my network and the other devices on it?

I'm paranoid about stuff like this.

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  • His company will not want to hack you, because a lawsuit would be pretty bad if a company was caught scanning and "hacking" third-party networks without permission. – ThoriumBR Nov 5 '20 at 22:09
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The company could use the laptop to scan everything on your network. What they can exploit depends entirely on what is exploitable.

To do this using best practice, you want to set up a separate network for the device. A lot of routers allow for a Guest network to be set up, and you could put your roommate on that.

You could put them on the ethernet and make sure that the ethernet LAN cannot access the WiFi network, if your router allows that sort of control.

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The best practice is set up a separate vlan to make sure your roommate is isolated from your network (vlan). The most easy way to do that is enable guest WIFI in your router.

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    Sorry, but this adds nothing on the already posted answer... – ThoriumBR Nov 5 '20 at 22:08
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What are the measures I can take to protect my network and the other devices on it?

Create a guest LAN if your router allows it. That's enough for this case.

Should I go for wired or wireless? (Speed and coverage area are not an issue yet.)

It does not matter. What does matter is if your router can create a guest LAN or not. If that's possible, put your friend on that guest LAN and you are good to go.

What are the things his company IT could know about and access from my network and what can they exploit?

They can do as much as anyone direct connected to your network, because by using your friend's notebook they are inside your network. Without a separated LAN, every device can be scanned, attacked and compromised.

But can does not mean will, and on this case, is far from it. No sane company will randomly scan and target any third-party network. Even you stating that you are paranoid, the company is surely more paranoid than you. A lawsuit against a company for hacking a third party without permission is something no company will want.

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