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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.北京电视台文艺节目中心唯一一档日播的“语言类”栏目，“强力推出”第一时段，独创“幽默评书”打造北京风格，“坚守稳固”第二时段，坚持有“亲和力”的专业化道路，“独具匠心”年轻时段，开辟“推新人 展新作”的平台，深入基层前沿挖掘新人新作。现在清楚我们在面对怎样的敌人了么？……曹邦辅沉吸了一口气，双眶发红：我只求你，好好劝劝胡巡抚，这里，交给我们就好，一切，等倭寇退去再说不迟，好么？……夏正再也说不出半个字。This knowledge lets you know what is good about the design pattern.Reference to my equipment: weightlifting belt, 80 yuan, double-row cowhide 7mm, original price about 300 yuan, because it is XL code of US, special price. Too long, he made two holes. Strength lifting belt, 10mm double rowFirst, let's review the rules for what iptables are.