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中军大帐里，苏岸来报：大王。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.故事发生在2018年的上海，讲述了生活在浦东新区的顾家，四代人在置换房子的过程中所经历的生活剧变。　　张琪全无恋爱经验，笨头笨脑的追求只能弄出笑话。马勇只好传授追求前妻的必杀技！张琪用马勇的方法应付晓红的考验，却微妙地令马勇仿如跟前妻重新谈一次恋爱！王穷察觉，抬眼一看，星眸和黑瞳相撞，伊人仿佛在问：你这么聪明，一定知道是怎么回事，是不是？他不禁心一颤，破天荒地红了脸，急忙垂下眼睑，伸手端起茶盏，喝了一口茶，才状似无意地说道：陈家此举，一是为了出货，二是为了筹款。