$IPT -A INPUT -p tcp --dport 3127 -m conntrack --ctstate DNAT -j ACCEPT
$IPT -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3127
$IPT -t nat -A POSTROUTING -o eth0 -j SNAT --to-source 10.4.11.71
$IPT -t nat -A POSTROUTING -j MASQUERADE
$IPT -A FORWARD -p tcp --dport 443 -j ACCEPT

$IPT -A FORWARD -o eth0 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
$IPT -A FORWARD -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT