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The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.Application scenario: Mediator mode is generally applied to situations where a group of objects communicate in a well-defined but complex way, and situations where you want to customize a behavior distributed in multiple classes but do not want to generate too many subclasses.该剧讲述了丧偶多年的退休老教师齐国盛和三个性格迥异的儿子的家庭生活故事。不管如何狼狈不堪，也阻挡不了这一家人在吵吵闹闹中勇敢追爱，奋力前行。白凡也沉声道：你二人若说的实话，就无需害怕。《康熙微服私访记》第三部分为三个单元，第一单元《锦袍记》、第二单元《食盒记》、第三单元《铃铛记》，每个单元独立成章，该剧将沿袭一、二部借古喻今、欢乐与忧伤结合的风格。不同的是《康》剧第三部节奏比前两部更加紧凑，人物侧重方面也有所变化，宜妃和三德子将作为主要人物演绎康熙私访期间发生的故事。这是一段尘封多年的传奇往事，发生在一个由帮会、租界、平民、警匪、日军、特工们组成的传奇上海。1931年，九一八的血雨腥风刮进了上海的十里洋场，三个来自不同家庭的年轻人因缘际会，在上海滩相遇。两个男孩一个出身于上海里弄的普通人家，一个被国民党军校校长收养，他们的小妹则是漕帮大佬最心爱的女儿。时代的洪流将他们扔进命运的熔炉，他们的青春、爱情、理想、信仰都受到了严酷的淬炼。随着他们身世之谜的逐步揭开，一幅巨大的上海俗世画卷也缓缓铺陈在眼前。当日本蚕食中国的阴谋浮出水面，当残酷的命运撕裂家庭与感情，当恐怖的谍影重重笼罩，党派斗争相互倾轧，在上海这座无助的孤岛上，他们兄妹三人也走上了完全不同的人生道路。1932年1月，严冬肃杀，日军终于对上海发动了蓄谋已久的攻势。无数的血性上海民众自发加入了这场旷日持久的战争中，他们与19路军同仇敌忾，不懈努力，谱写了一曲壮烈的悲歌，三个年轻人的命运也一起在此交缠纠葛，走向终点。A disaster. "Records of the Historian, Confucius Aristocratic Family": "(Gong Liangru) said: 'I was killed by my teacher in the past, but now I am killed here again, and my life has already passed." " Qing Ji Yun's "Notes of Yuewei Thatched Cottage, Luanyang Summer Record 5": "Although it is violent, it is good for its aunt, but there is a reason why she will not die." Ding Ling's "Water": "If you go to the town and want to find the mayor or director, give us some food first. We were killed last night." 2. Death due to persecution or accident. "Biography of the Three Kingdoms, Wu Zhi and Sun Ce" and "In the first year of Xingping, Yuan Shu. The technique is very strange. Pei Songzhi quoted Jin Yu Pu's" Biography of Jiang Biao "with the annotation of" Jian Bu Qu Hui Ce ":" When he met Yuan Shu in Shouchun, he wept and said: "The dead father entered from Changsha to beg for Dong Zhuo, and met the Ming emperor in Nanyang. The alliance was well formed. Unfortunately, he was killed and his career did not end." " Chen Qiyuan of Qing Dynasty "Yong Xian