Your Linux PC is only as secure as the settings you choose to enable (or disable).
I recently had another ADSL connection installed at home. I'm currently using Arno's iptables script found here to provide firewall, NAT and port forwarding but it doesn't allow different rules for ...
I've heard the question asked a lot in windows/networking forums, for an internet sharing application under windows to do banddith throttling for certain clients, the only one I've seen is Sygate's ...