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张大栓见儿子这番表现，心里说不出的畅快，哈哈大笑道：我刚才就在想，送了那么些贺礼，连顿酒都没喝完，我正心疼哩。他死了，都不会有人为他流泪……铁心兰语声渐渐哽咽，几乎连话都说不下去。反复几次。1. First handshake: Establish connection. The client sends a connection request message segment, setting the SYN position as 1 and the Sequence Number as x; Then, the client enters the SYN_SEND state and waits for confirmation from the server.Marley拜访了一个吓坏了的Scrooge，他发出警告：三个Spirits将拜访Scrooge。In addition to solving the port problem of A, the serial number problem also needs to be paid attention to. The serial number corresponds to the sliding window. The fake TCP packet needs to be filled with the serial number. If the value of the serial number is not in the sliding window of B when it is sent to B before A, B will actively discard it. So we need to find the serial number that can fall into the sliding window between AB at that time. This can be solved violently, because the length of a sequence is 32 bits, and the value range is 0-4294967296. If the window size is like 65535 under Windows I caught in the above figure, I only need to divide, and I know that at most I only need to send 65537 (4294967296/65535=65537) packets to have a sequence number fall into the sliding window. The desired value can be calculated quickly by exhaustion on multiple control hosts.