hjælp til firewall

Hej der Jeg har lavet et script der ser sådan ud:

# Diable forwarding
echo 0 > /proc/sys/net/ipv4/ip_forward

LAN_IP_NET='10.0.0.1/24'
LAN_NIC='eth1'
WAN_IP='min ip'
WAN_NIC='eth0'
FORWARD_IP='10.0.0.2'

# load some modules (if needed)
modprobe ip_nat_ftp
modprobe ip_conntrack_ftp

# Flush
iptables -t nat -F POSTROUTING
iptables -t nat -F PREROUTING
iptables -t nat -F OUTPUT
iptables -F

iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT

# enable Masquerade and forwarding
iptables -t nat -A POSTROUTING -s $LAN_IP_NET -j MASQUERADE
iptables -A FORWARD -j ACCEPT -i $LAN_NIC -s $LAN_IP_NET
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT

# Open ports on router for server/services
iptables -A INPUT -j ACCEPT -p tcp --dport 21
iptables -A INPUT -j ACCEPT -p tcp --dport 22

# STATE RELATED for router
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# Open ports to server on LAN
iptables -A FORWARD -j ACCEPT -p tcp --dport 21
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 21 -j DNAT --to 10.0.0.2:21
iptables -A FORWARD -j ACCEPT -p tcp --dport 22
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 22 -j DNAT --to 10.0.0.2:22

# Enable forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward

Men når jeg starter min firewall skriver den:

iptables v1.2.8: no command specified
try ' iptables -h' ot 'iptbæles --help' for more inforamtiom

hvad er det der er gået galt??