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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.Therefore, the benefits paid by employers to female employees on "Women's Day" are not included in the total wages.本剧的故事开始于我国抗战刚胜利初期，国民党晋西北的晋绥军蠢蠢欲动。其隔河相守的八路军某旅的狼队与之摩擦不断。随着战事升级，狼队 掩护 大部队跳出包围圈，随即跟随359旅转战到陕北。在陕北战场上，狼队展现出非凡的战斗才能和傲人的战术智慧。首长亲自授予他们“西北狼”的称号，让他们在西北战场狠咬“西北王”胡宗南。　　狭路相逢，勇者胜……个鬼嘞！秒怂开溜的她却被一盆狗血泼了个神清气爽——老狐狸车祸失忆了？！哈哈哈哈哈哈哈宁也有今天！However, under the circumstances at that time, I thought these things had little effect, because after we knocked them out, we began to gather in more quantities and launched attacks on positions from all directions. Judging from the form of attacks, they were quite organized and definitely beyond the reach of ordinary wild animals.Australia: 60,000From the perspective of service, DDoS protection is essentially a war in which users are the main body and rely on anti-D protection systems to compete with hackers. In the whole process of data confrontation, service providers often have absolute initiative. Users can base on specific rules of anti-D system, such as traffic type, request frequency, packet characteristics, delay interval between normal services, etc. Based on these rules, users can better resist DDoS of the seven-layer class and reduce the resource overhead of the server on the premise of satisfying the normal service itself. The detailed schematic diagram is as follows: