On Friday 05 December 2003 17:11, Robert Gil wrote: > In this script for iptables i cant seem to get the icmp flood protection > to work. Im limiting the icmp to 1/s and a burst of 4... (under ping of > death), same goes for syn flood allthough im not quite sure how to test > syn/ack/fin/xmas flooding. And how can i go about closing all ports to > syn packets except the ones listed so i dont have the responding. > Perhaps i have some things in the wrong order. Any help would be great. > > ~Rob Gil > ####################################################### > iptables -P INPUT DROP > iptables -P FORWARD DROP > iptables -P OUTPUT ACCEPT > > iptables -A INPUT -j ACCEPT -p tcp --dport 21 > iptables -A INPUT -j ACCEPT -p tcp --dport 22 > iptables -A INPUT -j ACCEPT -p tcp --dport 25 > iptables -A INPUT -j ACCEPT -p tcp --dport 80 > iptables -A INPUT -j ACCEPT -p tcp --dport 110 > iptables -A INPUT -j ACCEPT -p tcp --dport 443 > > iptables -A INPUT -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT > iptables -A INPUT -p udp -m state --state ESTABLISHED,RELATED -j ACCEPT > iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP > As a general rule it's good to have the ESTABLISHED, RELATED rule ahead of the generic ACCEPT rules since they will catch most of your packets. Jeff
