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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. The end result is that the server has no time to ignore the normal connection request-denial of service. If you look at the SYN_RECV status on the server with the netstat-an command, you can see that there are a large number of connection states that are "SYN_RECEIVED"待小葱全部清理完毕，再一清洗，伤处一阵火烧火燎，然后药粉洒下，更觉清凉舒适，再被温软的棉布一裹，帮他包扎的那双手也极为温柔，他因抵抗疼痛而绷紧的神经就放松了，疲惫之极，只想陷入沉睡。为了复仇，一名有着悲惨过去的神秘女子进入一个权势家族，后者不仅坐拥全球美妆帝国，还隐藏着黑暗的秘密。　　地位悬殊的悬念，错综复杂的恋情。This is the end of the source code analysis for log by default. After understanding the default, the latter three situations are simple.The frame structure is the most critical pillar supporting the pyramid structure, which can be expressed as the sentence pattern of "I advocate this because there are XX, 00 and". If the framework structure is not stable enough, the logic will be easily shaken.