Hi, everyone!

How do you limit access from green to red in ipcop? I understand that by
default a green interface has all services open. I want to restrict
access to port 80 for all users in the green interface. To do this I
think I need to modify the iptables. But where do they live?

Thanks in advance,

Jesus Zepeda

Well, assuming NAT, try

iptables -I FORWARD -p TCP --dport 80 -j DROP

also, you might want to check out http://iptables-tutorial.frozentux.net/iptables-tutorial.html for excellent help with iptables.