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When the client SYN packet arrives at the filter gateway, the SYN agent does not forward the SYN packet, but actively replies the SYN/ACK packet to the client in the name of the server. If the client's ACK packet is received, it indicates that this is normal access. At this time, the firewall sends the ACK packet to the server and completes three handshakes. The SYN agent actually replaces the server to deal with SYN attacks. At this time, the filter gateway itself is required to have strong ability to prevent SYN attacks.2 记忆归零　　大唐盛世，锦绣繁华。在造船业发达的滨海小镇常乐，人类女子陆漓女扮男装混入造船厂，希望能在船厂大展身手，实现自己扬帆远航的梦想，鲛人王子吴居蓝也带着神秘任务来到船厂，两人不打不相识，产生了纯洁的爱情。随着陆漓和吴居蓝的相爱，两人背后的阴谋也逐渐浮出了水面，陆漓在亲情和爱情之间痛苦挣扎。最终，陆漓和吴居蓝用爱化解了仇恨，人类和鲛人终于和平共处，同享盛世繁华。　　上古年间，魔教主幻影为夺取轩辕神剑，在修仙门叛徒灵光子 带领下，所有魔教弟子偷袭修仙门，毫无准备的修仙门与魔教 由此展开一场殊死搏斗，上古神剑轩辕剑也被封存在群山之中。 三百年后，上清掌门清秋飞升之际将灵虚剑与掌门之位传给无念，无念带领修仙门开始了漫长的寻找轩辕剑之路，途中遇到魔教余孽各种阻拦。正邪之间的爱情，背叛正义错综复杂，一系列的阴谋诡计和大开杀戒在仙魔两派之间上演。多年以后无念带领修仙门来到云海峰，与魔教再次激战，修仙门死伤无数，魔教弟子也是尸首异地，天心门李素玉与上清老掌门清秋的出现让无念终于取得轩辕神剑，凭借轩辕剑的威力将魔教头领幻影彻底斩除，魔军覆没，而无念的爱人小白为救无念受幻影重击元神俱灭。朕已经赐封‘白虎和‘玄武二将，不如让四灵俱全，也是一段佳话。陈启对启明的重视程度，的确出乎他的意料。