文章原址：https://www.cnblogs.com/xiaohanlin/p/11641273.html

centos7 firewall指定IP与端口、端段访问（常用）

1、启动防火墙

systemctl start firewalld.service

2、指定IP与端口

firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="192.168.142.166" port protocol="tcp" port="5432" accept"

3、重新载入，使配置生效

systemctl restart firewalld.service

4、查看配置结果

firewall-cmd --list-all

5、删除规则

firewall-cmd --permanent --remove-rich-rule="rule family="ipv4" source address="192.168.142.166" port protocol="tcp" port="11300" accept"