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  • centos7下部署iptables环境纪录(关闭默认的firewalle)(转)

    下面介绍centos7关闭firewall安装iptables,并且开启80端口、3306端口的操作记录:
    [root@localhost ~]# cat /etc/redhat-release 
    CentOS Linux release 7.2.1511 (Core)

    1、关闭firewall:

    [root@localhost ~]# systemctl stop firewalld.service            //停止firewall

    [root@localhost ~]# systemctl disable firewalld.service        //禁止firewall开机启动
    2、安装iptables防火墙
    [root@localhost ~]# yum install iptables-services            //安装
    [root@localhost ~]# vim /etc/sysconfig/iptables              //编辑防火墙配置文件
    # Firewall configuration written by system-config-firewall
    # Manual customization of this file is not recommended.
    *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
    -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
    -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
    -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
    -A INPUT -j REJECT --reject-with icmp-host-prohibited
    -A FORWARD -j REJECT --reject-with icmp-host-prohibited
    COMMIT
    [root@localhost ~]# systemctl restart iptables.service                  //最后重启防火墙使配置生效
    [root@localhost ~]# systemctl enable iptables.service                  //设置防火墙开机启动
     

    防止DoS攻击
    iptables -A INPUT -p tcp --dport 80 -m limit --limit 25/minute --limit-burst 100 -j ACCEPT
    -m limit: 启用limit扩展,限制速度。
    --limit 25/minute: 允许最多每分钟25个连接
    --limit-burst 100: 当达到100个连接后,才启用上述25/minute限制

    --icmp-type 8 表示 Echo request——回显请求(Ping请求)。下面表示本机ping主机192.168.1.109时候的限速设置:
    iptables -I INPUT -d 192.168.1.109 -p icmp --icmp-type 8 -m limit --limit 3/minute --limit-burst 5 -j ACCEPT

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  • 原文地址:https://www.cnblogs.com/hixiaowei/p/8664022.html
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