Someone in my household is hacking my devices

Would appreciate any kind not assistance with a situation I’m in.

We have family over and one of the young adult is very tech savy and is a hacker. I could tell because I used to be a system admin.

I have a basic internet ISP router/modem. I want to know if this guy is creating a fake network because ever since he came my wifi became spotty and disconnects.

What tools or things I can do to determine if he is doing something shady. I have a fedora on my laptop and windows on my desktop.

Any help would be great!

submitted by /u/Lying_king
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from hacking: security in practice https://ift.tt/JN6M41U