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我编写了一个脚本来建立与 apache 的连接(只是 TCP 连接),在建立 30 秒后,apache 将发送一个 syn ack。pdu 是一个保活的心跳吗?版本是 apache 2.4.6 os redhat 6.4
它只是 TCP 心跳 pdu。