Volume based inet controls

[Fletch <fletch@xxxxxxxxxxxxx>]

Have been searching the documentation for some controls where by I can 
specify a daily MB limit on a per user basis.  Mainly because I really 
don't care when or what my users look at on the internet, I just want to 
limit the amount they look at per day.  Have some ideas on doing it at 
ip level, but then its per machine, not per user and that would be 
unfair for those people who come in at night to use a machine that has 
already been locked out by the firewall.

If its not possible under squid, are there any other options/ideas for 
doing this?

thanks

Fletch