problemas iptables

Pessoal boa tarde nao to entendendo o porque do meu script nao esta funcionando pois no Conectiva 7 ele funciona, porem estou trocando de um ip nao valido para um ip valido atraves de uma conexao de radio, onde ele chega por um ip não valido e atraves de uma regra de nat transformo para valido o problema todo é quando DROP nas INPUT, OUTPUT e FOWARD ai trava tudo.

#!/bin/sh

case "$1" in

start)

#Adiciona em Log

/sbin/modprobe ipt_LOG

#Ablitar IP FORWARD

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

#Limpa Regras Existentes

iptables -F

iptables -F -t nat

iptables -X

iptables -X -t nat

# Regra para envio de pacotes via nat para o IP Valido(Regra especial dada pelo provedor)

#Somente ela funciona que e uma beleza.

iptables -t nat -A POSTROUTING -s IP Placa -d 0/0 -j SNAT --to-source IP Valido

iptables -t nat -A POSTROUTING -s IP provedor -d 0/0 -j SNAT --to-source IP valido

iptables -t nat -A POSTROUTING -o "eth0" -j MASQUERADE

iptables -A FORWARD -i "eth1" -j ACCEPT

iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A FORWARD -m limit --limit 1/minute --limit-burst 1 -j LOG --log-level DEBUG --log-prefix "Pacote IPT FORWARD ruim :"

#Seta as Politicas de INPUT, OUTPUT e FORWARD

#

#iptables -P INPUT DROP

#iptables -P OUTPUT DROP

#iptables -P FORWARD DROP

#Criar regras separadas para ICMP, TCP e UDP

#

iptables -N icmp_packets

iptables -N tcp_packets

iptables -N udp_packets

#Regras para allowed para TCP

#

iptables -N allowed

iptables -A allowed -p TCP --syn -j ACCEPT

iptables -A allowed -p TCP -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A allowed -p TCP -j DROP

#Regras ICMP

#

iptables -A icmp_packets -p ICMP -s 0/0 --icmp-type 0 -j ACCEPT

iptables -A icmp_packets -p ICMP -s 0/0 --icmp-type 3 -j ACCEPT

iptables -A icmp_packets -p ICMP -s 0/0 --icmp-type 5 -j ACCEPT

iptables -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT

#Regras TCP

#

iptables -A tcp_packets -p TCP -s 0/0 --dport 25 -j allowed

iptables -A tcp_packets -p TCP -s 0/0 --dport 110 -j allowed

iptables -A tcp_packets -p TCP -s 0/0 --dport 8080 -j allowed

#Regras UDP

#

iptables -A udp_packets -p UDP -s 0/0 --source-port 53 -j ACCEPT

iptables -A udp_packets -p UDP -s 0/0 --source-port 123 -j ACCEPT

#Regras Prerouting

#

iptables -t nat -A PREROUTING -i "eth0" -s 192.168.0.0/16 -j DROP

iptables -t nat -A PREROUTING -i "eth0" -s 169.254.0.0/16 -j DROP

iptables -t nat -A PREROUTING -i "eth0" -s 10.0.0.0/8 -j DROP

iptables -t nat -A PREROUTING -i "eth0" -s 172.16.0.0/12 -j DROP

iptables -t nat -A PREROUTING -i "eth0" -s 24.0.0.0/8 -j DROP

iptables -t nat -A PREROUTING -i "eth0" -s 127.0.0.0/8 -j DROP

#Regras Posrouting

#

#Regras de INPUT

#Estabelecidas nas politicas basicas

#

iptables -A INPUT -p ICMP -i "eth0" -j icmp_packets

iptables -A INPUT -p TCP -i "eth0" -j tcp_packets

iptables -A INPUT -p UDP -i "eth0" -j udp_packets

iptables -A INPUT -p ALL -i "eth1" -d "Gateway" -j ACCEPT

iptables -A INPUT -p ALL -d "Local" -j ACCEPT

iptables -A INPUT -p ALL -d "IP Placa" -j ACCEPT

iptables -A INPUT -p ALL -d "IP Valido" -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A INPUT -m limit --limit 1/minute --limit-burst 1 -j LOG --log-level DEBUG --log-prefix "Pacote de INPUT ruim: "

#Regras de OUTPUT

#

iptables -A OUTPUT -p ALL -s "Local" -j ACCEPT

iptables -A OUTPUT -p ALL -s "IP Placa" -j ACCEPT

iptables -A OUTPUT -p ALL -s "IP Valido" -j ACCEPT

iptables -A OUTPUT -m limit --limit 1/minute --limit-burst 1 -j LOG --log-level DEBUG --log-prefix "Pacote de OUTPUT Ruim: "

;;

stop)

iptables -t nat -D POSTROUTING -s 192.168.0.0/24 -d 0/0 -j SNAT --to-source 200.162.51.21

iptables -t nat -D POSTROUTING -s 10.0.3.2 -d 0/0 -j SNAT --to-source 200.162.51.21

;;

esac

Fabio Ramos

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