[CentOS] which firewall to automatically block bandwidth abusers?

From: Rudi Ahlers <Rudi at SoftDux.com>

> the servers in question provide a free service and no money is
> generated from it, but the client still pays for bandwidth so we'd
> like to cap heavy users a bit to avoid expensive bills.

Hum, if it is www traffic, maybe put squid as a reverse proxy and use delay pools?

JD