关于Ping的延迟

Question

ping返回的延迟是什么意思？

即下面的'时间'

C:\Users\guest>ping -n 2 www.google.com

Pinging www.google.com [62.252.60.89] with 32 bytes of data: 
Reply from 62.252.60.89: bytes=32 time=11ms TTL=58 
Reply from 62.252.60.89: bytes=32 time=15ms TTL=58

Ping statistics for 62.252.60.89:
    Packets: Sent = 2, Received = 2, Lost = 0 (0% loss), 
Approximate round trip times in milli-seconds:
    Minimum = 11ms, Maximum = 15ms, Average = 13ms

Answer 1

这是发送请求和接收响应之间的时间(也称为"往返时间").通常,对于本地主机或本地网络,这只是几毫秒,但对于例如卫星传输而言可能非常大(相对).

如果它可能超过一秒,您可能必须提高超时,以便不将其检测为丢失的数据包.

下图显示了这个想法.

    SENDER               RECEIVER
                  |    |
    ping request  |\   |
             ^    | \  |
             |    |  \ |
    latency -+    |   \| ping received
             |    |   /| ping response
             |    |  / |
             v    | /  |
    ping response |/   |
    received      |    |