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磨磨蹭蹭的赖在彭城不走，哼。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:?那彭城惨败可以说就是刘邦的一块心病，乃是他人生之中最为灰暗的一段。There are many kinds of injuries in WOW, such as ice, fire, shadow and nature. . . Among them, the natural damage small D and SM have, small D's anger. Lightning of SM. .可轻松那也是旁人轻松，赵家人如何轻松？赵耘气得牙根痒痒。Dependence Inversion Principle (DIP) means that abstraction should not depend on details, and details should depend on abstraction, which is the proposed "interface-oriented programming, not implementation-oriented programming". This can reduce the coupling between customers and specific implementations.在逃亡中，婴儿出生在了一个难民营里。刀枪当前，保住人类最后的希望，成为蒂奥心中唯一的信念。