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怎么优雅的实现 TCP Ping？
source link: https://www.v2ex.com/t/782913
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怎么优雅的实现 TCP Ping？
是计算使用 Raw Socket 手动发送 SYN 包 与收到 SYN+ACK 包的时间差，还是直接使用更上层的 TCP Socket，直接计算连接建立完成的时间？
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