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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.Red Net Time, April 22 (Reporter Hu Yi and Correspondent Zhao Cheng) On the evening of April 19, Super Net Comprehensive "I Am a Singer" ushered in the second knockout round. Eight singers and songwriters all brought the second original song on this stage. In the face of high-pressure and high-intensity programs, Wang Sulong, a powerful singer-songwriter, brought a self-described original song "Odd" in this issue after bringing a "Seed" of "Sing to Everyone" in the previous period.可是……他忽然轻声道：玉米，小叔要跟你说个事。……(未完待续。Jacket, underwear, head and shoulder, belt, shoes那主人姓谁名谁？宋义厉声追问。为打赢未来战争，东南军区组建了一支多兵种混编的合成作战师，代号DA师。这是一支带有试验性质的“王牌师”，它对每个渴望建功立业的军人有着巨大的诱惑力。师长人选成为上下关注的焦点，吴义文、赵梓明两位候选人均是志在必得，使出浑身解数，却被受命选将的钟元年副司令员无情剔除，特种大队长龙凯峰在应对了一连串的怪招、奇招、险招之后，意外地引起了钟元年的极大兴趣……