１ 停用firewalld
uname -r
3.10.0-514.26.2.el7.x86_64
systemctl stop firewalld.service
systemctl disable firewalld.service
２ 安装iptables
yum install iptables iptables-services
３ 启用iptables
systemctl start iptables.service
systemctl enable iptables.service
４ 保存配置：
service iptables save
本文转自 zengwj1949 51CTO博客，原文链接:http://blog.51cto.com/zengwj1949/2046487
