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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.一个是拍完一部长片后几乎赔掉自己人生的广告导演「南之仰」，绰号「南人」。他在「谈恋爱」方面的才华远远胜过他的电影梦，所以他被列入勤勤黑名单的原因，当然跟「很烂」有关。影片以1973年6月身患重症的周恩来总理，在特殊历史时期下肩负历史使命和老一辈革命家对老区人民的情怀回到圣地延安的历史事件为叙事中心，电影通过周恩来总理独有的视角回顾了中国革命在延安时期13年的重大历史事件，以四个时空表现了周恩来总理在延安的所见所闻、所思所感展示了中国共产党人不忘初心、砥砺前行的崇高责任感。The main raw materials for network wire conductors are: oxygen-free copper, all copper (copper-clad copper), copper-clad aluminum and copper-clad steel (copper-clad iron).林聪打头，引着青鸾公主和小蝶。　　本剧讲述了天窗首领周子舒为求自由，不惜以生命为代价退出组织，命不久矣之际遇上一心灭世的鬼谷谷主温客行，两人因卷入江湖纷争相识相知，最终成为彼此救赎的故事。一场阴谋，两个知己，五块宝藏拼图，廿载恩怨，千百年江湖梦。