简单的共享上网，eth1接内网，eth0是动态ip
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#!/bin/sh
IPT='/usr/local/sbin/iptables'
$IPT -F
$IPT -X
$IPT -P FORWARD DROP
$IPT -P INPUT DROP
$IPT -P OUTPUT ACCEPT
$IPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
$IPT -A FORWARD -i eth1 -j ACCEPT
$IPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
$IPT -A INPUT -i lo -j ACCEPT
$IPT -A INPUT -i eth1 -j ACCEPT
$IPT -t nat -F
$IPT -t nat -X
$IPT -t nat -P PREROUTING ACCEPT
$IPT -t nat -P POSTROUTING ACCEPT
$IPT -t nat -P OUTPUT ACCEPT
$IPT -t nat -A POSTROUTING -o eth0 -j MASQUERADE
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