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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.一章看完，杨舟不由目瞪口呆。一只小鸻鹬因为没有学会飞翔，而被迁徙的鸟群落下，它要一个人面对寒冷的冬天以及捕食者的威胁，最终在朋友的帮助下，他找到了温暖的避难地，迎来了又一个春天。路招摇（白鹿饰）出山之后救下墨青，却在夺取万钧剑时被墨青抢先，路招摇在万钧剑出世的巨大冲击下身受重伤，五年后伤愈回到自己的门派中，发现墨青将自己的门派建立得更加强大。路招摇隐瞒身份，利用墨青对自己的喜欢，让他去做很多危险的事情。却在墨青不断的宠爱中动摇了最初的目的。最后，路招摇和墨青共同打败了宗门伪善的洛明轩，将他的真面目公之于世。两人也在大战之后得以幸福相守。　　银风集团的总裁薛风是一个非常神秘的人物，他深深地爱着寥芳华，但是又深深地恨着林志航，因为当年林志航见死不救，导致薛风曾经身陷囹圄，做了十几年的牢。　　岂料一波未平，一波又起。这个炸弹狂徒竟然炸毁了警局的大门，还绑架了家驹的女友，要求家驹携带大量赎款前往货仓交换人质。当家驹身带巨款抵达货仓时，发现这里已经布满了炸弹……