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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.按照这个丈量方法，大概沿海每15丈算一亩海田，大概50米上下的样子，每五亩，就是250米沿海，这是一个可观的范围了，沥海所整个能支配的，恐怕也就是二十里的样子。“金万德”从身份卑贱的妓女到朝鲜巨商的传奇人物。是捐献自己的全部财产来救恤深受旱灾的济州岛民众的历史人物，是以身作则实现“地位高则责任重（noblesse oblige）”理念的伟大女性。这部剧灵感来自真实人物Stede Bonnet的冒险，他原本是个富绅，但却放弃了自己的特权生活，于18世纪初成为了海盗。南国王爷冷卿泽奉皇上之命迎娶了将军之女楚映瞳，于是两人开始了并没有感情的婚姻生活。婚后随着两人的相处，他们彼此相知，最后爱上对方。但皇上忌惮楚映瞳之父楚将军功高盖主，于是命冷卿泽亲自斩杀岳父，楚映瞳与冷卿泽的感情再次遭遇危机…