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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:?　　本片为刘家班鼎盛时期的经典力作之一，由当时红极一时的“功夫小子”汪禹担纲主演，其顽皮活泼、精灵鬼马的表演令人拍案叫绝。唐伟成所饰的大反派也非常出彩。本片剧情幽默搞笑，武打精彩新颖，是一部难得的经典动作喜剧片，值得品味。陌生，则是因为时间太久远了，这些记忆和画面不再鲜活，不再真实，成了死板的东西，仿佛久远的古画、书中的历史故事，与他不在一个时空。Note: When running shell commands here, if you want to call variables before python, you can do the following:法庭内，各人舌剑唇枪，为真理，为公正而进行抗辩；法庭外，各人面对种种感情考验，衍生段段纠缠不清的关系！我说黎将军你也真是的，咱大靖多少好女子，你干嘛非要娶那南雀国的公主呢？这不是让咱们大靖女子颜面无光么，好像咱们靖国的女子都入不了将军青眼。二小姐哭得跟泪人一般。