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CentOS 7 中默认的防火墙不再是iptables了,需要先关闭防火墙firewall再安装iptables
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
yum install iptables-services #安装
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原文地址:http://www.cnblogs.com/yyisgod/p/4607839.html