/sbin/insmod ip_conntrack_ftp

/sbin/insmod iptable_nat

/sbin/insmod ip_nat_ftp

echo "-  Enabling packet fowarding in the kernel"

echo  "1" > /proc/sys/net/ipv4/ip_forward

echo " - Enabling dynamic addressing measures"

echo "1" > /proc/sys/net/ipv4/ip_dynaddr

echo "-Resetting the firewall andsetting the default FORWARD policy to 

DROP"

$IPTABLES -P INPUT ACCEPT

$IPTABLES -F INPUT

$IPTABLES -P OUTPUT ACCEPT

$IPTABLES -F OUTPUT

$IPTABLES -P FORWARD DROP

$IPTABLES -F FORWARD

#You must change eth0 to ppp0 if you are using a modem or change eth0 and

#eth1 to another network device if that is not what you are using.

echo " - FWD: Allow all connections OUT andonly existing and related ones IN"

$IPTABLES -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT

$IPTABLES -A FORWARD -i eth1 -o eth0 -j ACCEPT

$IPTABLES -A FORWARD -j LOG

echo "- Enabling SNAT (MASQUERADE) funtionality on eth0"

$IPTABLES -t nat -A POSTROUTING -o eth0 -j MASQUERADE

echo -e "\nDone.\n"