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+= is to inform you when this event occurs, and -= is to inform you no longer when this event occurs.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.ABC翻拍，新TV版《查理的天使》4 我要去旅行抗战时期，黑山镇上，见习修女安娜到劳工营救治被日军山县严刑拷打的女地下党员苏雅。苏雅的坚贞让安娜感动，并萌生帮助她的愿望。在安娜的帮助下，游击队知道了苏雅的处境，并决定进行营救。逃狱成功，但慌乱中游击队却错过了安娜和苏雅，接走了其他的女犯。从此，安娜这个善良、羞涩的女孩走上了一条充满血雨腥风的道路。而且，我也不会国术，不能教你。车上走下来一个相貌不错、打扮不俗的二十七八岁的女性。