Actually blocking WiFi channels is done through the 802.11d information element ... | Hacker News

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		praseodym on May 24, 2014 \| parent \| context \| favorite \| on: Neutralizing the iOS camera click sound through ac... Actually blocking WiFi channels is done through the 802.11d information element in WiFi beacons which specify what the country the access point is in.

gurkendoktor on May 25, 2014 [–]

Maybe it is also transmitted that way, but changing the time zone from Australia from New Guinea has repeatedly fixed my OS X WiFi issues when a Chinese roommate used an illegal channel (in Australia).

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