systemctl stop firewalld.service #停止firewall

systemctl disable firewalld.service #禁止firewall开机启动

yum install iptables-services #安装

vi /etc/sysconfig/iptables #编辑防火墙配置文件

######################################

# Firewall configuration written by system-config-firewall

# Manual customization of this file is not recommended.

*filter

:INPUT ACCEPT [:]

:FORWARD ACCEPT [:]

:OUTPUT ACCEPT [:]

-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -i lo -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport  -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport  -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport  -j ACCEPT

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A FORWARD -j REJECT --reject-with icmp-host-prohibited

COMMIT

########################################

:wq! #保存退出

systemctl restart iptables.service #最后重启防火墙使配置生效

systemctl enable iptables.service #设置防火墙开机启动