IPT=/sbin/iptables
REDE=192.168.0.0/24
SQUID=3128
DNS1=200.149.55.142
DNS2=200.165.132.155
#### Ativa o roteamento
echo "1" > /proc/sys/net/ipv4/ip_forward
#### Limpa as regras
$IPT -F
$IPT -X
$IPT -F -t nat
$IPT -X -t nat
#### Mascara a conexão
$IPT -t nat -A POSTROUTING -s $REDE -d 0/0 -j MASQUERADE
#### Proxy Transparente - Redireciona todo o trafego da porta 80 pra porta do squid
$IPT -t nat -A PREROUTING -s $REDE -p tcp --dport 80 -j REDIRECT --to-port $SQUID
#### Ativa os modulos do Kernel
modprobe ip_conntrack
modprobe ip_conntrack_ftp
modprobe ip_nat_ftp
modprobe ipt_MASQUERADE
modprobe ipt_REDIRECT