CentOS7.x上怎么安装iptables

1、关闭firewall

systemctl stop firewalld.service

systemctl disable firewalld.service

2、安装iptables

yum install iptables-services

3、启动iptalbes，设置为开机启动

systemctl restart iptables.service

systemctl enable iptables.service

4、iptables已启动，默认只打了SSH的22端口