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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.情不知所起，一往而深………………这一期的《倚天》带给读者书友们很多感叹怅然，但是感叹怅然归感叹怅然，日子该怎么过还是要怎么过，这个世界也不会围着一本《倚天》转。AP or a　　面对商店街的神秘队伍”我爱夕阳红”、拥有全市最强战神罗可的岚翔体大，柔道社只能求助神秘的学校卫生清洁员，古夏。据说，攻陷女子短大宿舍、地下格斗擂台赛、袒裎相见的温泉旅行，完成这些作业，人人都能成为中国好柔员？！马列文（陈建斌 饰）是一位实体书店的守望者，他的梦想就是开办实体书店，让城市中的人们有可以沉下心来享受阅读乐趣的一方净土，因而不惜牺牲商业利润来守护精神家园。出于责任，他照顾着身患躁郁症的前妻王忆如（刘威葳 饰），而家庭教师简单（梅婷 饰）的出现为他的生活带来一丝慰藉。简单原是一位中学教师，辞去教职来北京与未婚夫冯春生（涂松岩 饰）结婚却惨遭背叛，简单在马列文的提点下勇敢拒绝了委曲求全的婚姻，并和马列文之间产生了莫名的情愫。马列文复杂的家庭关系使得二人虽已心意相通却彼此克制。而此时马列文前妻病愈归来想要复婚。面对责任、爱情以及岌岌可危的事业，马列文没有选择逃避，决定牵起简单的手，共同面对，最终战胜困难，实现了一直守望的梦想，收获成功，感悟幸福其实很简单。民国初年，江湖上燃起了一场血雨腥风，明家堡的盟主明帝为了一统江湖，公然挑战各大门派，一时间满目沧桑，尸横遍野。年幼的君绮罗遇见了从死人堆里爬出来的沈斯如，求父亲将她收留身边，当马车越过尸体离开草地时，绮罗发誓总有一天要建立一个没有杀戮的江湖。 春去秋来，十二年过去了，当年的斯如已成长为一名亭亭玉立的少女，她随君家父女一起住进君家的“药坊”，开始了她传奇的一生。A message (usually a response message) is sent by a native process: OUTPUT--> POSTROUTING