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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.为平息遍布中华的抗清复明烈火,多尔衮派遣西王吴三桂、定南王孔有德、敬谨亲王尼堪 率领三路大军南下清剿,就在这时多尔衮劳累身亡。鳌拜手握大权,作威作福。中华大地，狼烟滚滚，试问天下，谁主沉浮？地下世界第一季……而且就算你背熟了《白发魔女传》，你看上去像一个作家吗？听了顾小玉的话，付宇锋恍然大悟。"State Mode"是由香港电视广播有限公司制作的古装题材电视剧，由洪永城、黄心颖、汤洛雯及谢东闵领衔主演，郑子诚、潘志文、郭少芸、及张慧仪联合主演，监制欧耀兴。——《绝代双骄》的灵魂，那个被你们忽略的人。