1 保存iptables
iptables-save > /etc/iptables.rules
 
2 创建启动文件
touch /etc/network/if-pre-up.d/iptables
chmod +x /etc/network/if-pre-up.d/iptables
内容如下:
#!/bin/sh
iptables -F
/sbin/iptables-restore < /etc/iptables.rules