Networking – How to block a phone from using the WiFi network?

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How do I block my son's phone from using my home WiFi network? Can it be done by blocking the MAC address of my son's phone?

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You could just change the WIFI security password and don't tell your son the new password.

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Networking – How did the Marriott block wifi hotspots

If you read the FCC release further it says:

Marriott operates a Wi-Fi monitoring system manufactured by a third party that was installed at the Gaylord Opryland. Among other features, the system includes a containment capability that, when activated, will cause the sending of de-authentication packets to Wi-Fi Internet access points that are not part of Marriott’s Wi-Fi system or authorized by Marriott and that Marriott has classified as “rogue.”

A Wi-Fi Deauthentication Attack uses a feature of the IEEE 802.11 protocol called a deauthentication frame which is a "sanctioned technique to inform a rogue station that they have been disconnected from the network".

An attacker can send a deauthentication frame at any time to a wireless access point, with a spoofed address for the victim. The protocol does not require any encryption for this frame and the attacker only needs to know the victim's MAC address, which is available in the clear.

A good article on how to do this is Forcing a device to disconnect from WiFi using a deauthentication attack

Note that this is prevented by the new Protected Management Frames (PMF) feature of WPA2 and WPA3, also known as IEEE 802.11w-2009.

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Networking – How did the Marriott block wifi hotspots

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