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[Collection Value]The foundation of SYN flooding attack is the design of three-way handshake when TCP is used to establish connection. The third packet verifies that the connection initiator has the ability to accept the packet at the source IP address used in the first request, that is, its return is reachable. Figure 1 shows the process of exchanging packets at the beginning of a normal TCP connection.老鼠捧茶请人客We should know that at ordinary times, the system does not enable the SynAttackProtect mechanism. It only enables and adjusts the TCP/IP protocol stack when SYN attacks are detected. So how does the system detect SYN attacks? In fact, the system judges whether it is attacked by SYN according to the three parameters of TcpMaxHalfOpen, TcpMaxHalfOpenRetrieved and TcpMaxPortsExhausted.System.out.println (name + "deal! ");古晶（周星驰饰）是有名的整人专家，他独来独往，专收取高昂费用，代人整蛊仇家及敌人，计划高超，手法独特，故被称为“整蛊界”第一高手。他开了一家整人公司。华仔和父亲共同生活，他在公司中备受赏识，并取得了副总经理的职位。就在庆祝他升迁的晚会上，他认识了匿名前来的公司董事长的女儿。二人产生了好感。经过一段时间接触，二人坠入爱河。这一切引起了同为追求者的阿雄的嫉妒，于是他找来了古晶。古晶冒充华仔同父异母的弟弟进入他的家庭，从此一场大混乱开始了。默基不忿女友乐儿移情别恋，特意请古晶来对付文杰，要文杰失掉爱情与事业。杰为人可爱热诚，令晶不忍心下手，决意助杰对付默基，默基请来“整蛊之霸”对付众人，因而进行连场整蛊大斗法……