近年来，DDoS攻击和DOS已经愈演愈烈，成为了互联网安全的主要威胁之二。

DDoS 攻击者利用成百上千个「被控制」结点向受害结点发动大规模的协同攻

击。通过消耗带宽、CPU 和内存等资源，达到使被攻击者的性能下降甚至瘫痪

和死机，从而造成其他合法用户无法正常访问。和 DoS(Denial of Service，拒

绝服务)攻击比较起来，其破坏性和危害程度更大，涉及范围更广，也更难发现

攻击者。

今天我们先来说一说什么是DoS？

从广义上来说，任何导致被攻击的服务器不能正常提供服务的攻击手段都属于

DoS 攻击的范畴。直观地说，就是攻击者过多地占用系统资源直到系统繁忙、

超载而无法处理正常的工作，甚至导致被攻击的主机系统崩溃。它利用网络连接

和传输时使用的 TCP/IP、UDP 等各种协议的漏洞，使用多种手段充斥和侵占系

统的网络资源，造成系统网络阻塞而无法为合法的网络用户进行服务。

DoS 攻击最简单的方法利用了系统的设计漏洞，比如 Ping of Death(POD，死

亡之Ping)、Teardrop等等。其中Ping of Death就是通过发送超过IPv4最大

封包大小65535 字节的ping封包，从而导致系统崩溃。

另一种 DoS 攻击方法是利用计算量很大的任务，比如加密解密操作，大量消耗

被攻击主机的 CPU 资源，达到攻击的目的。

德迅云安全ip：

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