hot spot managment

[Steven C. Peterson]

I am working with a client of mine that owns a restaurant in Nashua he 
is looking to add a free hotpot to his restaurant but does not want
people not in the restaurant using it

My thinking would be to have some sort of authentication code that 
changes every so often but am not sure how to do this and if i can with 
low cost hardware ( ie
not getting a commercial AP.

the only other way i can think of restricting access within the 
restaurant is to use directional antennas.

Any help would be greatly appreciated

Steven


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