How-To IP Tables (Firewall) per vostro Server

nano /etc/init.d/firewall

#!/bin/sh
### BEGIN INIT INFO
# Provides:          custom firewall
# Required-Start:    $remote_fs $syslog $network
# Required-Stop:     $remote_fs $syslog $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: firewall initscript
# Description:       Custom Firewall
### END INIT INFO

case "$1" in
start)

$IPT -A INPUT -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPT -I INPUT -i lo -j ACCEPT
$IPT -I OUTPUT -o lo -j ACCEPT
# SSH
$IPT -A INPUT -i eth0 -p tcp --dport 22-j ACCEPT
# OSCAM WEBINTERFACE
$IPT -A INPUT -i eth0 -p tcp --dport 16002-j ACCEPT
# CCCAM
$IPT -A INPUT -i eth0 -p tcp --dport 12000-j ACCEPT
# CCCAM WEBINTERFACE
$IPT -A INPUT -i eth0 -p tcp --dport 16001-j ACCEPT
# CS378X
$IPT -A INPUT -i eth0 -p tcp --dport 12345-j ACCEPT
# CAMD35
$IPT -A INPUT -i eth0 -p udp --dport 12345-j ACCEPT
# BLOCCO PING
$IPT -A INPUT -i eth0 -j REJECT
# SICUREZZA
$IPT -A INPUT -p icmp -m icmp --icmp-type 8 -j DROP
$IPT -A FORWARD -p tcp --syn -m limit --limit 1/s -j ACCEPT
$IPT -A FORWARD -p tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s -j ACCEPT
$IPT -A FORWARD -p icmp --icmp-type echo-request -m limit --limit 1/s
echo "Firewall attivata"
exit 0
;;

stop)
$IPT -F INPUT
echo "Firewall disattivata"
exit 0
;;

restart|reload|force-reload)
$0 stop
sleep 1
$0 start
exit 0
;;

*)
echo "Usage: $0 {start|stop|restart|reload|force-reload}"
exit 1
;;
esac

chmod 775 /etc/init.d/firewall

ln -s /etc/init.d/firewall /usr/sbin/f

f start
f stop
f restart
f reload
f force-reload