Unknown devices on my network

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I logged into the GUI/admin for our Arcadyan modem (192.168.) a day later. We recently set up a brand new iPad (not refurbished) a few days ago and connected it to our guest network. MAC Address filter is also on and set to accept only our devices.

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We currently have Telus Internet and use their Arcadyan modem (tall white box) with our guest wifi network turned on.

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My concern is if someone is hacking into our network through our iPad (believe it's called a 'virtual handshake'). I'm new to this forum and want to first thank you folks in advance for providing feedback to my concern.