IPTABLES GUIDE
***** SAMPLE DEFAULT IPTABLES file************************ # Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -p UDP -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT *********************************************************************** ********************IPTABLES Command line Examples ******************************************** Drop all Incoming ICMP ---------------------- iptables -A INPUT -p ICMP --icmp-type 8 -j DROP Drop all Outgoing ICMP ----------------------- iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP Allow