1.centos7自带了firewall,而不是iptables:
关闭firewall:
service firewalld stop
或者:
systemctl stop firewalld
禁止firewall:
systemctl mask firewalld
下面是替换成iptables操作:
yum -y install iptables-services
开机启动:
systemctl enable iptables
启动iptables:
systemctl start iptables
that‘it...
原文：http://www.cnblogs.com/garfieldcgf/p/5987319.html