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Linux系统管理初步（五）Linux系统的防火墙-firewalld 编辑中-Linux学习之路-51CTO博...
source link: http://blog.51cto.com/11934539/2065873
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CentOS7中，系统自带的netfilter操作程序由iptables变为firewalld。firewalld引入了zone的概念，一、firewalld中的9个zonefirewalld这个模块zone这个概念指的二、firewalld的应用操作前，我们看下当前系统中应用的是哪种防火墙程序。systemctllist-units--all--type=service|egrep'fi
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