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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.胡四已经哆嗦着拾起灯笼，再次点着了，一边道：胡周去了这么久，该不会……余下的话他不敢再说，怕胡老大骂他。以世界上最知名的城市为背景，伦敦谋杀案将戏剧性地讲述一队顶级谋杀侦探的经历。流畅、现代和快速移动，该系列将像一部尖端纪录片一样拍摄。伦敦谋杀案的每一集都将聚焦于侦探们发现谋杀背后真相后发生的不同谋杀案，但也将有一个涉及首席侦探失踪妻子的系列故事。12. The term "poor visibility" refers to any situation where visibility is restricted due to fog, haze, snow, storms, sandstorms or any other similar reason.　　殷婷与理浩决定反击，复仇In the "Column Separation" dialog box above, check "Separation Line" to display a straight separation line between the two columns.他回去书院后，对长随洪庆吩咐了几句，洪庆便骑马出了清南村。