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沉迷于Instagram，自夸后排。《双重生存》第二季于2011年4月22日在探索频道播出。这一系列紧随科迪·伦丁和戴夫·坎特伯雷之后，他们展示了在各种假设的生存场景中生存所需的条件。Half-connection survival time: refers to the longest survival time of entries in the half-connection queue, that is, the longest time from receiving SYN packet to confirming that this message is invalid. This time value is the sum of the longest waiting time of all retransmission request packets. Sometimes we also call the half connection survival time Timeout time and SYN_RECV survival time.Action:ThreadPool----User-defined thread poolThe above example show that that default policy for the FORWARD chain in the filter table is set to ACCEPTFrom the perspective of service, DDoS protection is essentially a war in which users are the main body and rely on anti-D protection systems to compete with hackers. In the whole process of data confrontation, service providers often have absolute initiative. Users can base on specific rules of anti-D system, such as traffic type, request frequency, packet characteristics, delay interval between normal services, etc. Based on these rules, users can better resist DDoS of the seven-layer class and reduce the resource overhead of the server on the premise of satisfying the normal service itself. The detailed schematic diagram is as follows: