Andrew Squibb wrote:
> I'm looking into setting up a wireless access point as part of a
> commercial venture, but want to control access to the internet using
> some kind of server software (ie. someone buys a card with a code on.
> That code is valid once for an hour).
>
> Without this code the person cannot get through to the internet. The
> wireless access point uses the computer as a gateway.
>
> Can Linux do this?
>
>
>
> Andrew Squibb

Take a look at NoCatAuth - http://nocat.net/.
The software is excelent and works very well. If you are doing
something special - you can easily script it - like imposing time limits
and durations.