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/etc/sysctl.conf 文件用于配置 Linux 内核参数。通过修改此文件，可以永久性地调整内核行为，以优化系统性能、增强安全性或满足特定的应用需求。修改完成后，执行 sysctl -p 命令使更改生效。
一. TCP 三次握手
1.1 客户端优化
在 TCP 三次握手中，客户端作为主动发起连接方，首先发送一个 SYN 包，进入 SYN_SEND 状态。客户端会等待服务端回复的 ACK
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