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Compared with other quite sophisticated network attacks, DDOS attacks are not only the use of attack techniques, but also a competition of resources, including network bandwidth resources and server resources. Without sufficient resources, it is nonsense to talk about defending DDOS attacks. Therefore, at present, the defense against DDOS attacks mainly lies in hardware protection, and software protection has little effect.In RedHat linux, enabling SYN cookies is accomplished by setting the following command in the startup environment:爹去，只怕就回不来了。Amplification attack is a special reflection attack. The special feature is that the reflector has the function of amplifying network traffic and is a common technical means in DDoS. Its basic principle is relatively simple. For a C/S service, if the Server-to-Client Response message is larger than the Client-to-Server Request message, the traffic is enlarged. In order to use amplification technology in DDoS, one condition needs to be met, that is, the services provided by Server are based on connectionless protocols such as UDP.刚才吵什么，我听见赵兄弟在骂人？王突并不想放过这事。　　逃亡途中，他们不仅要对付各种各样令人棘手的突发事件，还要与追捕他们的执法官库利斗智斗勇。这个锲而不舍地家伙发誓要把这三个“脱网之鱼”送回监狱。这一路上意外不断，状况百出，究竟他们能否获得真正的自由？1968.07-太阳王子霍尔斯的大冒险