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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.Cpu shutdown!B. Women:-49KG,-57KG,-67KG, + 67KG嬴子夜想要顺利离开是不行的，而且即便是顺利走了，尹旭怕是也会有麻烦，这可如何是好呢？尹将军有些犯难了。　　刀尖向前！周翡的刀是父母精髓造就：母亲是刀身，刀鞘是父亲。 早年间，小周翡的外公李徵为救段九娘身中剧毒。伪帝突袭，四十八寨失守。周翡的妈妈李瑾容——那时少女，刚烈莽撞，刀法未成。失家丧父的她千里策马，找梁绍的谋士周以棠求援。梁绍不允，周以棠暧昧，李瑾容怒而独自北上，决意刺杀伪帝。 周以棠不忍见她赴死，不惜违背梁绍、自废武功，发兵救寨。李瑾容不解周以棠的韬晦，行刺失败后仍执意犯险，导致“情疯子”段大郎身死、周以棠险被误杀，她与段九娘也被伪帝双双虏获。 处决之际，对决之时，李瑾容顿悟了“无匹破雪刀法”。周翡父母亲刃血的爱情，如尖刀入鞘。位于东京下町的日式咖啡馆“LYCO RECO”。