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I surely hope this question is not a duplicate of another; I had difficulty finding a cut and dry solution for this on my own, so I thought I might have some luck sharing it with the Hive Mind of collective human consciousness that is the Stack.

My goal is simple: I seek to broadcast a signal within a very small space (approximately 1000 square feet) that will block wireless access to a specific Access Point. In doing so, I am hoping to avoid blocking access to any other access points in this airspace. There is one specific unsecured Metropolitan Area Network in my area that represents a potential security liability.

I have the requisite authority to broadcast a signal within a short distance to essentially "scramble" this particular signal. I do not, however, have the capacity to make any changes to the ACTUAL WiFi access point in question; therefore, I cannot manually set up firewall rules or a MAC address filter to the AP that needs to be masked.

I do, however, have control over all other access points in this airspace, and can change their ESSIDs, channels and other configuration at will. I can also set up additional APs if need be, in order to try to close off access to this network.

One method I had considered would be to set up an BackTrack instance, or DD-WRT router, or HyperWRT/Tomato router, with the goal of aggressively intercepting wireless access point association requests for the wireless network that I want to block... I have not given this a go, yet, as I had hoped to confirm that it is the correct solution before attempting to employ it.

Any help that can be offered is greatly appreciated.

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closed as off topic by Sven, EEAA, Greg Askew, Ward, phoebus Apr 10 '13 at 15:49

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Sounds like you're effectively trying to do something along the lines of "jamming" the wireless network but for only the SSID. Jamming networks and signals can cause legal issues. Hmm. I guess your goal is to stop people from connecting to this unsecured network? – tombull89 Apr 10 '13 at 12:07
If you are so concerned about your users connecting to this network, then you ought to enforce policy on their devices such that they cannot choose arbitrary networks to join. – EEAA Apr 10 '13 at 12:40
Build a Faraday Cage around the secure area. This will passively block all radio signals from coming into the area; and it's totally legal. – 1.618 Apr 10 '13 at 14:03
You can deploy a blacklist of wi-fi SSIDs to your client machines through an Active Directory GPO. – Eric Falsken Apr 10 '13 at 18:38

What you're describing is illegal in the US:

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