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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.QueuePutListener满桌菜色，就算是素的，娃儿们也吃不下多少。No.1 Li Yifeng根据赵树理小说《三里湾》改编。糟华北农村的三里湾村正筹划着开渠、护社，支部决定让村长范登高去动员富裕农民糊涂涂让出他家祖传的刀把地。范登高不但不予理睬，还带头反对。范登高的女儿灵芝与糊涂涂的儿子有翼，是村中仅有的两个中学生，他们和自己的父辈进行了斗争。在青年们的努力下，三里湾开渠、护社的事终于成功。灵芝和有翼也分别实现了自由婚姻的心愿，找到了各自的幸福。