iptables是什么

一、iptables简介

默认Iptables防火墙有4个表5个链：

二、CentOS7卸载firewalld

1、停止firewalld

systemctl stop firewalld
systemctl disable firewalld
yum remove firewalld

2、删除firewalld相关文件

[root@localhost ~]# find / -name firewalld
/etc/selinux/targeted/active/modules/100/firewalld
/etc/firewalld
/var/log/firewalld
/usr/lib/firewalld
rm -rf 删除上述查到的文件

3、验证

systemctl status firewalld

三、安装iptables

yum search iptables

yum install iptables-services.x86_64
Systemctl enable iptables
Systemctl start iptables
Systemctl status iptables

四、配置iptables

1、查看规则