can I limit the ammount of bandwdth an IP gets ? and can i also limit the amount of GB an IP van download max in a month?
I've not had a need to use this myself and therefore can't say if it may be useful to you, but it looks interesting. It may be a bit more complex than you wanted. Take a look here:
Download site http://www.4shared.com/dir/v1BuINP3/Toastman_Builds.html (inc. torrent downloads)
Make a Paypal Donation http://toastmanfirmware.yolasite.com/donations.php