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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.Action: Back somersault.愤青见状也有些慌了：我也……不记得了……梁知府在旁呵斥道：说就是说过，没说就是没说。　　弗拉纳甘重写剧本，此前由Akiva Goldsman改编。After we have modified the rule, if we want the modification to take effect permanently, we must use service iptables save to save the rule. Of course, if you misoperate the rule but do not save it, then after restarting iptables with the service iptables restart command, the rule will return to the same appearance as it was when the/etc/sysconfig/iptables file was last saved.Generally speaking, Nagoya's subway route is developed and not particularly complicated. Although it is not very cheap, it is not expensive and has no edge. It is very convenient to go anywhere with more than one kilometer and one stop.