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The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?一份诏书流传天下，越王同时册封了两位夫人，却没有那位传闻中的汉国小郡主。Conforming to the explosive growth of China's cultural and tourism industry, "Charming China City? The" City Alliance "was formally established. The alliance brings together the participating cities of "Charming China City" to build a cooperative and shared platform for the development of cultural and tourism industries. Ha Xuesheng, director of the program department of CCTV's financial channel, Tang Lin and Mei Xiangrong, producers of CCTV's financial channel "Charming China City", awarded licenses to members, directors and representatives of executive directors of the City Alliance.屋子里忽然诡异地安静下来。Each player has 4 chances to be allowed to foul, and the fifth time he leaves the game (6 times in NBA). And cannot play again in the same match. A free throw is a shot when no one can stop or defend it. It is a punishment for the foul team and gives the other team a chance. The free throw should stand behind the free throw line and shoot within 10 seconds after taking the ball from the referee. After shooting, the ball cannot step over the free throw line before touching the basket. 　　少年牧尘，资质卓绝，出生于北灵境九大域之一牧域。其父为牧域域主，其母身份神秘，在牧尘年幼时被迫离开，他立下誓言，要找回母亲。他凭借天赋被审判之镜选中进入竞技历练，在历练时救了陷入困境的少女洛璃，两人产生了懵懂的感情，相约以后一起进入北苍灵院。作为北灵境独个能进入竞技的人，却在一年后因别人算计被诬陷为“灵路血祸”的凶手而被逐出比赛。不屈的牧尘机缘巧合下遇到九幽雀，获得神功。通过刻苦训练，参加学院面向牧域的海选，突破至尊境界并取得冠军，得以进入北苍灵院学习。为了救母亲，牧尘要变得更强，他与九幽雀为了寻找能让自身进步的不朽图纸，闯入精彩绝伦的大千世界，来到疆域辽阔的大罗领域。在经历腥风血雨后，牧尘救出自己的母亲，消灭了为祸人间的邪族，从草根少年成长为撼动大陆、为善除恶的大英雄，同时收获了爱情和友情 。陈启回答一声，然后磨蹭了一会儿，才走到厨房。