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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:?初中毕业后就再也没有看过书的老李，头一次准备去买《天河魔剑录》的实体书，支持一下华夏，乃至世界，最好的作家紫月剑。讲述了麻石老街上第二、三代住户赵钱孙李四家的生活故事。A3 is an object pointer to Tank and should inherit IntervalTimer, which is independent of confrontation and battle, so there is also a control system similar to confrontation in battle.他就要向周爷爷、向周菡展示自己的真情，而不是跟王穷比能力才华，更不能比权势和地位。爷爷虽然感激她，可是，并不能产生跟你奶奶当年那样的感情。1953年，新中国开始了第一个五年计划。林然以省委书记的身份回到盘龙市，领导大规模的建设工作，并完成中央布置的建立国防工业基地的重要任务。他的两个养子——烈士遗孤云海东和国民党将领遗孤石明挥，这时已分别担任了大型钢铁厂的公方副厂长和苏联专家组俄语翻译。更让林然惊喜的是，回到盘龙市的第一天，他就见到了失踪20年的女儿林想——国家安全部门的一名侦察员……