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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.吕雉和曹参都这么说，樊哙纵然想要请命也不好说出口，夏侯婴更加不方面推辞，只要硬着头发答应了。指着人头攒动的街道为难地对赵锋道：可是将军，你看这里……赵锋道：这里咋了？有人打架闹事了？人家老百姓啥也没干，你还不许人家瞧热闹、卖东西？大路朝天，他们想从哪过就从哪过。　　沉眠着现在的人类无法制造的贵重遗物。影片围绕一起杀妻案件展开，张赫与河正宇、朴熙顺分别饰演嫌疑犯、律师和检察官，上演头脑对决，再现法庭上紧张激烈的气氛。尉缭皱眉沉思片刻，开口道：若是子夜和尹旭确实如此的话，我倒是有个想法。"I Love Invention" 20160723 Socks Wear New Clothes