How to block people from sharing their 3G connection via wifi or bluetooth ?
 

Hi.

I have to block users with 3G phones who share their internet connection to laptops. It's in a university.

I already though about some GSM jammer, but it's way too powerful.

So i'm thinking about a de-auth spamming of wild access points, using aircrack or any other tool.

The bluetooth jamming, although not a priority yet, will have to be blocked one day or another.

Any suggestion anyone ?

you can't block connectivity between two devices that you have no control over with anything short of a jamming device.

The AP spam would work, but you'd have to spam for every named access point, and even then it isn't foolproof - the user just has to go through them one by one, or choose the one with the highest signal strength (cell phone broadcasts would be 100% strength to anyone trying to use it, most likely).

A more underhanded way would be to connect to the access points and take up all the bandwidth, but that might actually be illegal.

Here's a thought. A user usually has to be a member of the dialout group in order to use a 3G modem. (or a phone as a 3G modem). If you just remove all users from the dialout group or better still, don't make new users members of the dialout group to begin with, they should be unable to use their phones as modems. :)

Here's another thought. Why are you concentrating on wireless tethering? Wouldn't wired tethering be an equal problem?

What might help is if you explain a bit more background about what you're trying to accomplish and why. There might be other approaches that would be more feasible.

Well, some examinations using a computer, ours or student's laptop, are polluted by cheaters who uses internet when our wifi is blocked.

That's what we may try to fight.

That's a tough problem. If you provide the computer, then at least you could shut down or eliminate the wireless card and USB ports. That would potentially cut out those avenues. You probably also need to take a look at restricting what hardware students can have when taking the test. In either case, I don't think that trying to block bluetooth or wireless are really going to do the trick.