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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.可是，往后再不会有这样的日子了。Well, the concept of IPTables is summarized here for the time being. After understanding the concept, it is absolutely appropriate to practice it in combination with actual commands.《呆货》（暂定名）讲述的是因故被调任到地方高中的体育老师“基哲”（马东锡饰），和怀疑朋友突然失踪的高中女生“裕贞”（金赛纶饰），一起揭开事件真相的故事。清岑（江铠同 饰）从小就失去了父母，成为了孤苦无依的孤儿。然而苦难的童年并没有破坏她对生活的希望和热情，清岑拥有着比常人灵敏数倍的嗅觉，凭借着这一天赋，她投身于香水研制行业，渴望能够在这片领域中实现自己的理想——报答将自己养育长大的孤儿院。温斯顿·杜克,莎姬·贝兹,比尔·斯卡斯加德,本尼迪克特·王,大卫·里达尔将携手出演小田埃德森自编自导的导演处女作[九天](NineDays,暂译)。影片讲述在一个远离我们所认知的现实世界的房子里,一个隐居的人(杜克饰)面见了人类灵魂化身的准候选人(贝兹,斯卡斯加德,王,里达尔饰),原因是这个人曾经拥有的特权——生育。影片将于今夏开机。苔湾主岛多山，在多年季风洋流的影响之下，唯西面地势稍为平坦，借此时机，以苔湾府为中心，徽王府开始南北圈地，其中难免舞刀弄枪，将反抗强烈的原住民逼上山去，此亦为无奈之举。