centos6系统，开启：chkconfig iptables on 关闭：chkconfig iptables off
centos7系统，开启：systemctl enable firewalld 关闭：systemctl disable firewalld
centos6系统，开启：service iptables start 关闭：service iptables stop
centos7系统，开启：systemctl start firewalld 关闭：systemctl stop firewalld
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