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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:?Java is a typical object-oriented programming language, so this tutorial is based on Java to explain these 23 design patterns. If you don't know Java, please hit the "Java Tutorial" to learn.Liu Guiduo has been sticking to his guns and denied all the charges.Chapter III Qualification License明知故问，众人心中的愤恨越来越浓重。莱斯利希望能在国家公园管理局的一块土地上中标，但面临着包括她的新死敌罗恩·斯旺森在内的一个团体的竞争。同时安迪和阿普里尔是m。yakubd.cc担心他们现在又老又无聊。