Centos 7 安装使用 iptables

1.关闭firewall

systemctl stop firewalld.service

2.禁止firewall开机启动

systemctl disable firewalld.service

3.先检查是否安装了iptables

service iptables status

4.安装iptables

yum install -y iptables

5.升级iptables

yum update iptables

6.安装iptables-services

yum install iptables-services

7.查看iptables对外开放了哪些端口

iptables -L -n

8.修改iptables配置

vi /etc/sysconfig/iptables
#开放端口
-A INPUT -m state --state NEW -m tcp -p tcp --dport XXXX -j ACCEPT
-A OUTUT -m state --state NEW -m tcp -p tcp --dport XXXX -j ACCEPT

9.重启iptables使配置生效

systemctl restart iptables.service
systemctl enable iptables.service