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#!/bin/sh
# 黄海反复试验了几次，发现在设置之前关闭防火墙才是最安全的办法，否则会发生连接不上的问题
service iptables stop
iptables -F
iptables -X
iptables -Z
# 允许连接到的内网
iptables -A OUTPUT -d 10.10.21.20 -j ACCEPT
# 允许连接到的外网
iptables -A OUTPUT -d 219.149.194.55 -j ACCEPT
iptables -A OUTPUT -d www.cnblogs.com -j ACCEPT
# 允许icmp包通过,也就是允许ping
iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
#本机对外请求相当于OUTPUT,对于返回数据包必须接收啊，
iptables -I INPUT -i lo -j ACCEPT
iptables -I INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
#信任IP
iptables -A INPUT -s 10.10.21.20 -j ACCEPT
# 开放80端口
iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp --dport 80 -j ACCEPT
#关闭其它人员进入
iptables -P INPUT DROP
# 禁用所有出去的网络
iptables -P OUTPUT DROP
# 保存iptbales规则
service iptables save
# 重新启动
service iptables restart
