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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.1. The user accesses a form page.在一座山间小城中，一对低配劫匪、一个落魄的泼皮保安、一个身体残疾却性格彪悍的残毒舌女以及一系列生活在社会不同轨迹上的小人物，在一个貌似平常的日子里，因为一把丢失的老枪和一桩当天发生在城中的乌龙劫案，从而被阴差阳错地拧到一起，发生的一幕幕令人啼笑皆非的荒诞喜剧。苏氏集团大小姐苏菀妍在婚礼现场抓包未婚夫和继妹偷情，愤怒之下选中了前来参加婚宴的秦氏总裁秦天凌作为自己的新任丈夫。原来苏菀妍查出自己三年前的车祸和生母的去世都是父亲所为，于是选择秦天凌作为自己的复仇工具人。婚宴前，苏菀妍就以自身拥有的苏氏集团股份做交换，让秦天凌帮助自己收购苏氏。婚宴后当她要转让股份时，意外发现自己把股份托管给了名为莫勤的前男友，苏菀妍不得不私下寻找前男友。直到有一天她发现，所谓的莫勤就是秦天凌，一切都是秦天凌的爱情陷阱，早在她遇到他之前，就已经爱上了他。一把宝刀雪藏了许多，如今更加的锋利，锐不可当，是时候让他重建天日了……全文字无广告你对越国目前的形式怎么看？尹旭轻声问道，他想知道韩信有着怎样的看法，或许能提供些参考。