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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.你已经很有名了，东海谁不知你徐海？也要记住你的名字。在《神爱傻瓜》中，中层技术支持员工克拉克·汤普森在与同事爱美莉·拉克相爱的同时，无意间成为了上帝的使者。更别提还有溜冰、火湖和即将到来的末日。几天前，陈启给爱丽丝讲述紫衫龙王的故事时，说过这首歌，没有想到，现在爱丽丝竟然自己唱了出来。　　憧憬成为帅气的大魔法使的赛特，泽德期待着获得体育奖学金，而艾迪生正在为西布鲁克的国际助威比赛做准备。然后，突然，外星生物出现在西布鲁克周围，这不仅仅是友好的竞争。一个以血开始的故事，一个以血结束的故事，一片神秘的橄榄林，孕育着生命，更埋藏着深深的情仇。阴谋是否最终大白天下，亲情能否战胜法理，正义是否得到昭雪，一切都在那片神秘的橄榄林……在一片充满神秘而又诡秘气氛的橄榄林里，埋藏着一座惊天的宝藏。这个宝藏正是金州大文物商肖振雄一辈子所孜孜以求的财富。但是通往宝藏的秘密只有刘汉的父亲。