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If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.月饼我就没送了，他们家的月饼肯定比咱们这样人家做的好。三十年代旧上海，歌舞升平，纸醉金迷，有那么一个倔强的女孩——宋永芳，白天是圣约翰大学神秘的旁　　水立方嬉水乐园，是世界上唯一一座全方面将所有跟水有关的娱乐集结而成的梦幻乐园，园内除了各项娱乐设施之外，旅馆、餐厅、电影院、商店、银行等日常所需的各项机构均应有尽有，俨然是一个以「水」为中心的大型社区。而在这个社区的最顶点，也就是水乐园的老板，则是号称天下第一美人的陈总经理。而老夫子、大番薯、老秦三人也在此打工，分别担任清洁工、驾驶员、以及救生员的工作。退一万步说，就算他们真不同意，也不是就没法子了。《谢文东 第二季》再掀江湖风云，看东哥如何愈战愈强，带领文东会登上江湖顶端……Button-Pipeline Attack