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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.站在营帐外的空地上，尹旭不知是喜是忧？脚步声响起，走过来一个黑黝黝的男子，三四十岁的年纪。然而秦军步步推进，搜索极为仔细，若不是这场及时雨，藏身之处暴露只是迟早的问题。李斯很清楚事情是向前发展的，能够报仇就已经足够了。Foam extinguishing香荽缩在奶奶怀里，难得地没有吭声。