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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.Two patterns involving event distributors are called Reactor and Proactor. Reactor mode is based on synchronous I/O, while Proactor mode is related to asynchronous I/O. This article mainly introduces the knowledge related to Reactor pattern.10. The "length" and "width" of a ship mean its total length and maximum width.赵炳斗（赵仁成 饰）是一个三流社团的小头目，家中有两个弟妹，母亲身体不好，生活困顿；他在社团里也混得不如意，老大不器重，净派一些当街打架、恐吓收债的小事情，本来应该他接手的游戏厅也被别人抢了功。"When the two mountains were fighting, I have fought many battles, However, the most impressive one was the battle to defend position 149 during the July 12 War. I thought that the war was between people and people. I didn't expect to fight with animals here, not only animals, but also flying in the sky and drilling in the soil. If it weren't for the use of new shells to support us later, the position would have been lost. "