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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.　　他在异世界接下的任务只有一项──「杀了被预言会带给人类灾厄的『勇者』」。板栗对青鸾郡主道：我本待找机会向皇上进言，为你姐姐求情，请皇上放她走。　　谁也不知道，“孔雀翎”其实早在数十年前已神秘丢失。幸好新一代的少庄主秋凤梧智勇双全，为了继承孔雀山庄的百年声誉，不负武林正道所托，以茶楼店小二“小武”的身份，打入庞大的黑恶势力“青龙会”，潜伏在杀手组织中。Transaction Code: COOISThe fighting situation at position 149 to be talked about next is many different from that at positions 169 and 142 mentioned earlier, because for the first time there is a "flying unit" among the "living biological weapons" appearing at position 149.