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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.咳……这……凤海尴尬一咳嗽，跟着他家少爷混了半天也重新熟了，当即也没什么隐瞒，货郎肯帮忙……多半是……看我媳妇漂亮么。老杨却丝毫不怒，反而要燃：说下去。郑老太太道：人家嘴上说不计较，你知道他心里计较不计较？回头横竖看紫茄不顺眼哩？郑氏沉吟了一会，道：王家不像那等睚眦必报的人家。(1) Basic DescriptionThen let's look at the next section!