erro no iptables

caros estou rodando o firewall e esta dando o seguinte erro:

modprobe: Can't locate module iptables_nat
Using /lib/modules/2.4.26/kernel/net/ipv4/netfilter/ip_conntrack_ftp.o.gz
Using /lib/modules/2.4.26/kernel/net/ipv4/netfilter/ip_nat_ftp.o.gz
iptables v1.2.10: --tcp-flags requires two args.
Try `iptables -h' or 'iptables --help' for more information.


Meu iptables ta assim:

Código :

---

#!/bin/bash
echo 1 > /proc/sys/net/ipv4/ip_forward
modprobe iptables_nat
insmod ip_conntrack_ftp
insmod ip_nat_ftp
 
# Limpa tabela
#iptables -F
 
# Fecha tudo
iptables -P INPUT DROP
#iptables -P OUTPUT DROP
iptables -P FORWARD DROP
 
# Proteção contra ping suspeito
iptables -A FORWARD -m unclean -j DROP
 
# Contra ping
iptables -A FORWARD -p icmp --icmp-type echo-request -j DROP
 
# Contra ping of death
iptables -A FORWARD -p icmp --icmp-type echo-request -m limit --limit 1/s -j ACCEPT
 
# Contra syn-floods
iptables -A FORWARD -p tcp -m limit --limit 1/s -j ACCEPT
 
# Contra port scanners
iptables -A FORWARD -p tcp --tcp-flags SYN,ACK,FIN,RST -m limit --limit 1/s -j ACCEPT
 
# Mascaramento
iptables -t nat -A POSTROUTING -o eth+ -j MASQUERADE
 
# Liberando portas
iptables -A FORWARD -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -p tcp --dport 25 -j ACCEPT
iptables -A FORWARD -p tcp --dport 110 -j ACCEPT
iptables -A FORWARD -p tcp --dport 22 -j ACCEPT

---

tem o modulo de NAT no kernel?

modprobe iptable_nat

O seu está iptables_nat :cry:

Sds,