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On the one hand, the core components of the network infrastructure have never changed in the past ten years, which makes some discovered and exploited vulnerabilities and some mature attack tools have a long life cycle and are still valid even today. On the other hand, the rapid development of the application of the Internet seven-layer model has diversified the attack targets of DDoS. From the web to DNS, from the three-layer network to the seven-layer application, from the protocol stack to the application App, the endless new products have also given hackers more opportunities and breakthrough points. Moreover, DDoS protection is a project with unequal technology and cost. Often, the construction cost of a business's DDoS defense system is larger than the cost or benefit of the business itself, which makes many start-up companies or small Internet companies unwilling to make more investment.The firewall sets the SYN forwarding timeout parameter (the firewall for state detection can be set in the state table), which is much less than the timeout time of the server. When the client sends the SYN packet and the server sends the acknowledgement packet (SYN + ACK), if the firewall has not received the acknowledgement packet (ACK) from the client by the time the counter expires, it sends the RST packet to the server to cause the server to delete the half connection from the queue. It is worth noting that the setting of gateway timeout parameters should not be too small or too large. If the setting of timeout parameters is too small, it will affect normal communication. If the setting is too large, it will also affect the effect of preventing SYN attacks. This parameter must be set according to the network application environment.Spider Prince Nicholas嗨，要我说，夫人高兴，这比什么都好，孝敬那位有前程的将军，不一定有什么结果，但夫人有了新镯子，笑在世伯面前，这是真的。　　在学校里，千秋恃才傲物，可看似桀骜不驯的他内心却充满了彷徨。某日，千秋和不可思议少女野田惠（上野樹里饰）意外相遇，野田妹是钢琴天才，乐谱看一遍就能记住，能弹出动人心弦的旋律。同时，她也是个偷吃别人便当，不洗澡、不收拾房间，整日净干些奇奇怪怪事的邋遢女。赵文华干笑道：应该的，儿本就是代父巡视东南。