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The SYN-Flood attack is currently the most common DDoS attack on the network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing. This kind of attack was discovered as early as 1996, but it still shows great vitality. Many operating systems, even firewalls and routers, cannot effectively defend against this kind of attack, and it is very difficult to trace it because it can easily forge the source address. Its packet characteristics are usually that the source sends a large number of SYN packets and lacks the last handshake ACK reply of the three handshakes.季木霖气他转移话题，便没好气地说：这么大个人还吃什么零食。杭州司衙，唐顺之南巡，胡宗宪拉上徐文长亲自接见。三十年代的上海是冒险家的梦天堂，造就了很多动人心弦的枭雄故事。本故事是讲述一个小伙子杜国笙(陈庭威)，在昔日繁华璀璨的黄埔滩，终其一生追求人生富贵、名利、权力、爱情.....等，他的得与失本剧自有分晓。Divorce is fine. Give me the diamond ring.The real threat lies in amplification attacks using reflection principles, In the network service protocol provided by the reflector, There needs to be an asymmetric amount of request and response data, The amount of response data needs to be greater than the amount of request data, The larger the ratio of the response data to the request data, the larger the amplification factor of the amplifier, and the more obvious the effect of consuming bandwidth resources caused by amplification attacks. However, the number deployed on the Internet is very small, so amplification using the network service cannot achieve a large flow and can only be used as an auxiliary means.