CentOS防火墙iptables安装及配置

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安装 yum install iptables   配置 vim /etc/sysconfig/iptables   例如： *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT   # web -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT   # ftp -A INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT   # ssh -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT   -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT     查看端口状态 /etc/init.d/iptables status   启动/停止/重启 service iptables start/stop/restart