註釋：裏面的IP我給該成192.168.1.1了！
本來裏面有ppp的代理腳本，它本身也註釋了～～所以我就給刪了！
其他都沒改！
可以參考着直接用！
#!/bin/bash
echo "1" > /proc/sys/net/ipv4/ip_forward
INET_IFACE="eth0"
INET_IP="192.168.1.1"
IPT="/sbin/iptables"
/sbin/depmod -a
/sbin/modprobe ip_tables
/sbin/modprobe iptable_nat
/sbin/modprobe ip_nat_ftp
/sbin/modprobe ipt_LOG
$IPT -P INPUT ACCEPT
$IPT -P FORWARD ACCEPT
$IPT -P OUTPUT ACCEPT
$IPT -t nat -P PREROUTING ACCEPT
$IPT -t nat -P POSTROUTING ACCEPT
$IPT -t nat -P OUTPUT ACCEPT
for TABLE in filter nat mangle ; do
$IPT -t $TABLE -F
$IPT -t $TABLE -X
done
$IPT -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
for DNS in $(grep ^n /etc/resolv.conf|awk '{print $2}'); do
$IPT -A INPUT -p udp -s $DNS --sport domain -j ACCEPT
done
$IPT -N LOGDENY
$IPT -A LOGDENY -j DROP
$IPT -A INPUT -p tcp --dport 22 -j ACCEPT