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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.Although there are many unpredictable potential causes for new attacks, according to our experience, the following two events may trigger the occurrence of new attacks:不知怎的，有些无措，心中感慨万千。Drop the slices in boiling water, turn off the flame, let macerate for an hour, then filter out a first batch of dye.好容易站稳了，忙匆匆吃了点东西，就骑马去见林聪。中国历史上，大宋王朝开国皇帝与[唐宗]并称，史称[唐宗宋祖]。宋祖（赵匡胤）生于战乱的五代十国时期，为寻治国安邦的道路，四海寻游，交友投军，吃尽风霜甘苦。一盘棋输了华山，流传至今的[卖华山]典故由此而成。道长指点迷津并赠盘龙棍传授棍法。赵匡胤告别道长下山除土匪救京娘，留下传世佳话：[千里送京娘]。为嫁赵匡胤，京娘自杀。 　　赵匡胤率大兵北征契丹，在陈桥驿发动兵变，[黄袍加身]自立为帝，建立大宋王朝。宋祖开始南征北战，公元963年平定荆南和湖南、965年灭后蜀、971年灭南汉、975年灭南唐……俘虏南唐后主李煜，留下千绝句[问君能有几多愁，恰似一江春水向东流……]。后蜀主孟昶投降，其风流貌美的小妾押回京后，投入宋太祖怀抱，后又和可谓自古英雄美女天设定！为解除将领兵变隐患，鸿门设宴，演绎不流一滴血的[杯酒释兵权]事件