1.描述问题
2.解决方案
systemctl stop firewalld
systemctl mask firewalld
Then, install the iptables-services package:
yum install iptables-services
Enable the service at boot-time:
systemctl enable iptables
Managing the service
systemctl [stop|start|restart] iptables
Saving your firewall rules can be done as follows:
service iptables save
参考：http://www.bubuko.com/infodetail-1954829.html
http://blog.csdn.net/song_csdn1550/article/details/51768671
http://blog.163.com/xavier_666/blog/static/25884000720163299503423/
http://blog.csdn.net/song_csdn1550/article/details/51768671