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Chu can also see clearly that the reason is that there are too many of them. Let's describe them this way-it looks like a dark cloud rising out of thin air in the rainforest. "Zhang Xiaobo said.See? It's in town.天启的武侠就是好单身的生活并非你想象的那样，三个单身狗不同的职业讲述不同的单身生活。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.Rmvirtualenv ENV: Deletes the runenvironment ENV