Question : Problem: How do you monitor the download usage of wireless users?

I have a satellite internet connection with a fixed daily download limit set by my internet provider. I have anywhere from 3 to 8 computers sharing this connection during the day. These computers each connect through the wireless router to the modem. I do not know of anyway to centrally monitor how much each computer is downloading. I have asked each user to use restraint in downloading, but some one or two users take more than their share, which puts me over my limit, and that causes my provider to shut off the service for awhile.
Is there anyway I can monitor how much each user has downloaded each day from my computer? I have tried various things that I downloaded, but none of them worked.
Another thought I had was to setup a dedicated computer that would serve as the "gateway" to the internet. All traffic would run through it before sending it to the modem. This computer would then keep track of what each user was downloading. (I use the word "gateway" not really knowing it's technical meaning, but you get the idea.)
Looking for suggestions, preferably cheap ones, since this is in my home.
Thanks

Answer : Problem: How do you monitor the download usage of wireless users?

You can use some of the free Firewall's. They can also monitor the downlad from each station and can report it throughoptiona software.

Try:
IPCop here http://www.ipcop.org/
SmoothWall here http://www.smoothwall.org/

They both support the add-on called URL Filter. You can find it here: http://www.urlfilter.net/. The
URL filter can log traffic and limit bandwidth, enforce transfer quota, limit size of the contents and limit the download of executables, p2p or streaming on each client individually or as a group.

It is basically Squid + Additional software. If you're good with Linux you can try to build a gateway for yourself using squid and something like dansguardian. You can find DansGuardian here http://dansguardian.org/

Hope this helps.

Cheers,
K.