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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.该剧以伊豆国豪族北条时政的次子、镰仓幕府第2代执权北条义时成为日本实际执政者的故事。该剧得名于镰仓幕府设置的十三人合议制。　　本片由Frank Nissen 执导，编剧则由 Steve Bencich 、Ron J. Friedman 、Eddie Guzelian 、Robert Reece 、Colleen Millea Ventimilia 共同完成。片中是由 Tami TappanData collected during MDT meetings (such as clinicopathological data, etc.) should be fed back to MDT members for learning and improvement after analysis.L Quanzhou is the first and only 5A scenic spot, a must-visit landmark scenic spot!