TCPIP in 24 Hours, Sams Teach Yourself by Joe Casad

Author:Joe Casad [Casad, Joe]
Language: eng
Format: azw3, epub
Publisher: Pearson Education
Published: 2017-03-09T05:00:00+00:00

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By the Way: Looking Closer at Ping Output

The output for the ping command varies according to the implementation. In some systems, the output is a single line stating IP_address is alive. Some versions of Linux (by default) send ICMP packets and output packet response information continuously until you press Ctrl+C. Windows systems typically send four ICMP Echo Requests and output four responses. It is not uncommon to receive three or even fewer responses to those four Echo Requests. You should not consider the occasional dropped datagram a failure, though, because ICMP does not guarantee delivery. However, missing responses could be an indication of an overcrowded network. Dropped packets notwithstanding, the most common responses to a ping are that all requests were successful (indicating that the connection is working) or that all requests were unsuccessful (indicating that the connection isn’t working).

Some versions of the ping utility display the time in milliseconds from the time the Echo Request message is sent until the Echo Reply message is returned. Short response times indicate that a datagram does not have to pass through too many routers or through slow networks. If ping responses are returning with a Time To Live (TTL) value near 0, it might be an indication that the connection is near the TTL threshold and some packets are getting lost or re-sent.

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