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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.Make practice part of your routine//154　一尊价值连城的佛头丢失，引得这世间的人们为之伤神，为之奔波，他们的种种行为既令人同情又令人啼笑皆非，那种人世间的亲情、友情、恋情；贪心、揣度他人之心，都表现得入木三分，启迪人们为之三思……吴凌珑扶着门，奋力转向海舍一边，儿子没了，我就什么都没了。"Bus Day Voucher"因为父亲的病重，家庭主妇彭妮接管了家族的马场，而她还要完成父亲的心愿，那就是让自己的赛马夺冠。她能实现这个愿望吗？令狐冲开怀大笑，说道。