Someone

#!/bin/bash

. /etc/rc.conf
. /etc/rc.d/functions

INTERNET="eth0"
SERVICII="http ssh auth 1600:1650 27015 27952"        # servicii (porturi) care pot fi accesate din interneti


case "$1" in
start)
        stat_busy "Starting Firewall"
        iptables -P INPUT DROP                          # blocheaza tot
        iptables -A INPUT -i ! ${INTERNET} -j ACCEPT
        iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # permite pachetele din conexiuni deja stabilite

        # accepta conexiuni noi pe porturile din $SERVICII
        for i in ${SERVICII}; do
        iptables -A INPUT -p tcp --dport ${i} -m state --state NEW -j ACCEPT
        done

        # NAT, daca nu aveti nevoie, stergeti linia
        iptables -t nat -A POSTROUTING -o ${INTERNET} -j MASQUERADE
        echo 1 > /proc/sys/net/ipv4/ip_forward

        #Deschid port pentru torrent
        iptables -t nat -I PREROUTING -p tcp --dport 22769 -i ${INTERNET} -j DNAT --to 192.168.0.2
        iptables -t nat -I PREROUTING -p udp --dport 22769 -i ${INTERNET} -j DNAT --to 192.168.0.2
        #DC
        iptables -t nat -I PREROUTING -p tcp --dport 22768 -i ${INTERNET} -j DNAT --to 192.168.0.2
        iptables -t nat -I PREROUTING -p udp --dport 22768 -i ${INTERNET} -j DNAT --to 192.168.0.2


        stat_done
;;
stop)
        stat_busy "Stopping Firewall"
        iptables -F INPUT
        iptables -P INPUT ACCEPT
        # opreste NAT, daca nu aveti nevoie, stergeti linia
        iptables -t nat -F POSTROUTING
        stat_done
;;
restart)
    $0 stop
    sleep 1
    $0 start
;;
*)
    echo "usage: $0 {start|stop|restart}"  
esac
exit 0