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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.});太好看了。修车工阎涛平日受尽老板的欺辱，打斗中误杀老板。逃到偏远的青石镇库区躲避生活。看水库的老李是阎涛的远房亲戚，把阎涛安排在一个旷野中独立的别墅里。但是老李严禁闫涛去二楼。闫涛某夜隐约听到楼上有声音，强大的好奇心驱使阎涛走向了二楼。推开门的那一刻阎涛发现了一个惊天秘密……Public void exe ();《背叛》这部电视剧将告诉您：一个自己把自己策划入狱囚犯，在众叛亲离之后的翻然悔悟。这既是一部大变革时期的灵魂忏悔灵，也是一曲深沉的人间正义之歌