[Wolves] Wifi Access Control - not php

[Wayne Morris]

Hi,
As anyone got any suggestions for creating my own version of 'the cloud' 
wifi control, preferably with cheap or free software.
Basically the company I work for has a load of student houses, each with 
a Virgin wifi box - we currently manually change the wifi password every 
month,
then charge one tenant a fee, who then passes on the code to all and 
sundry, so we only ever get one fee.
Since the maximum revenue from a house even if all pay is < cost of 
virgin box, can't afford to use The Cloud or anything like (Cloud I 
think is £130 a month)


Ideally would like something that sits on a centralised server, and 
grants access for periods regardless of which box is being used.
Would something like this be done by setting the dns of the Virgin box 
to the server, then running a log in script which then allows dns searches?
Prob I foresee with this is that if a user sets his network card up to 
use his own dns servers, then he defeats the object.

Any ideas?

Cheers

Wayne