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A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.《DOCTOR White特别篇》将于3月28日22点15分在关西电视台·富士电视台播出。电影《爱情对赌》主要讲述了方力（楼云飞饰）和其父（万梓良）方子良因为觊觎毕哥（文熙饰）家祖屋，和其提出一场爱情对赌。内容为：限定三个月内，毕哥成功帮助当地一富家千金萌萌（范薇饰）走出感情隐瞒并且收获一段新的恋情为输赢。究竟谁赢谁输还未曾得知，文熙饰演的毕哥能够赢得方力，这一切都吊足了影迷们的胃口。而女主角贝贝（沈璐饰）至始至终从出谋划策到忍痛割爱也为她与男主角毕哥的爱情做了赌注。Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:1960年代香港赌博风行，其中一个派系是以老千技术闻名的“千门八将”。成员龙四（郑则仕饰）在一次大肆出手之后，其大师兄庞峰（秦沛饰）因着间接害死亲弟的同门恩怨，与华探长文雄（汤镇业饰）设局陷害他入狱，女友百合（张慧仪饰）更被文雄抢去。五年后，龙四出狱适逢香港电影发展迅速，进入片场耕耘下成为地位崇高的制片，有舒奇（蔡瀚亿饰）、麦基（吴业坤饰）两位得力助手，还有一个刚相认的女儿小雨（王子涵饰）。好景不常，助手们开始要独力面对片场中各种争斗和感情关系，而同门师弟妹相继出事和反目，亦使龙四无法独善其身，在“东方荷里活”上演无数场的“千门事，千门了”……