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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.张姑娘回来见了，自然明白。谢大人。宋元一原本是一名普通的出租车司机，儿子宋跃因踢球腿骨折，昂贵的康复费让宋元一犯了难，谁料想醉酒乘客徐财神把里面含有大量现金的包落在了宋元一的车上。同一时间，快递员周几在屡屡投诉中失业。丢包的徐财神因为包中藏有犯罪秘密而心神不定，无奈几个手下办事不利，徐财神找到周几，并给他“所有的尊严与成就都来自于金钱”的错误灌输。就这样，周几和宋元一在寻包和藏包的追逐战中分别踏上了非正义之路。(Machine Turn: Writer hiroki's Individual Performance Project. The third mini album "One Person in the King's World" combines the records of 4 places in the real-time ranking list and 3 places in the J-POP ranking list on the main messenger website. The concept of "second puberty" is equal to the length, and the world view of the same lyrics in the real my novel is the heart of the listener.)郑氏点头，摸着闺女软软的小身子，心里十分难受：香荽这么小，却比红椒还有心计，面上一派纯真无害的模样。"News 1 +1" 20190527 Sun Xiaoguo Involved in Black Case and "Iron Case" Tracking!