centos 7 安装及配置 iptables

如何配置iptables防火墙的步骤

检测并关闭firewall

systemctl status firewalld.service #检测是否开启了firewall
 
systemctl stop firewalld.service #关闭firewall
 
systemctl disable firewalld.service #禁止firewall开机自启

安装iptables

yum install iptables-services

写入iptables配置文件

vi /etc/sysconfig/iptables

增加下面一行80端口

# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us to add additional ports/services to this default configuration
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80  -j ACCEPT 
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

重启firewalld

systemctl restart firewalld.service

允许firewall开机自启

systemctl enable iptables.service

重启防火墙

systemctl restart iptables.service