如何判断被CC了，要如何防御 43.248.191.x

CC攻击是DDOS的一种，前身名为Fatboy攻击，也是一种常见的网站攻击方法。CC攻击原理就是模拟多个用户对一些资源消耗较大的页面不断发出请求，从而达到消耗服务器资源的目的。CC主要是用来攻击页面的，当一个网页访问的人数特别多的时候，每一个访问的人服务器就需要时间来处理这些信息，这时候大量的人数就会造成打开网页变慢的情况，像CC就是模拟多个用户不停地进行访问那些需要大量数据操作的页面，造成服务器资源的浪费，CPU长时间处于100%，永远都有处理不完的连接直至网络拥塞，正常的访问被中止。

CC攻击类型有一下几种： 1、直接攻击：主要针对有重要缺陷的Web应用程序，这种情况比较少见，一般只有在程序写出错的时候才会出现。2、代理攻击：代理攻击是黑客借助代理服务器生成指向受害主机的合法网页请求，实现DOS和伪装。攻击者模拟多个用户不停地进行访问那些需要大量数据操作，需要大量CPU时间的页面。3、僵尸网络攻击：攻击者通过各种途径传播僵尸程序，然后当用户感染并激活病毒时，攻击者就可以控制电脑，并下发各种远程命令，最后随着被感染的电脑越来越多，就形成了庞大的僵尸网络。

CC攻击主要是以策略进行防御的。通过设定一些特征分析攻击的IP（CC攻击基本上都是同个方式发出的比较多，例如同一时间某些连接模式量比较大，这类可能就是攻击特征。），进行阻断和屏蔽。所以CC防御最重要的一点就是误封率。即防火墙是否会把正常访问的IP连同攻击IP一起阻断屏蔽。这个也是CC防御好坏的一个重要判断因素。

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