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DDo S(分布式拒绝服务 )攻击是来自 Internet的各个地方的许多主机同时向一个或多个目的站点发起攻击 ,每个主机向受害站点产生大量通信量 ,使受害站点变得严重拥塞 ,从而无法向合法用户提供服务或提供的服务质量严重下降。DDo S攻击使 Internet的脆弱性暴露得更加清楚。通过对 DDo S攻击过程的分析及 Internet体系结构的描述 ,从而理解防范 DDo S攻击的困难 ,同时文章也简单介绍了 DDo S的主要工具 ;最后提供了一些防范DDo S攻击的对策以减小攻击所产生的影响
DDoS attacks are attacks that many hosts from various parts of the Internet attack simultaneously to one or more destination sites. Each host generates a large amount of traffic to the victim site, causing the victim site to become severely congested so that it can not The quality of services provided to legitimate users or services provided is severely degraded. DDo S attacks expose the vulnerability of the Internet more clearly. Through the analysis of DDo S attack process and the description of Internet architecture, we can understand the difficulty of preventing DDoS attack. At the same time, the article also briefly introduces the main tools of DDo S. Finally, some countermeasures against DDo S attack are provided to reduce the attack The impact of