Ping

最新推荐文章于 2025-08-22 14:25:18 发布

转载最新推荐文章于 2025-08-22 14:25:18 发布 · 76 阅读

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原文链接：http://www.cnblogs.com/analylx/p/9597872.html

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本文详细介绍了Ping工具的功能，包括如何通过序列号确定数据包丢失、重复或错序的情况；如何检查数据包的完整性和往返时间（RTT）；以及如何报告ICMP消息。同时，文章也指出了Ping工具无法提供的信息，例如数据包未被响应的具体原因、损坏或延迟的原因及位置等。

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Ping is implemented using the required ICMP Echo function, documented in RFC 792 that all hosts should implement.

Ping places a unique sequence number on each packet it transmits, and reports which sequence numbers it receives back. Thus, you can determine if packets have been dropped, duplicated, or reordered.
Ping checksums each packet it exchanges. You can detect some forms of damaged packets.
Ping places a timestamp in each packet, which is echoed back and can easily be used to compute how long each packet exchange took - the Round Trip Time (RTT).
Ping reports other ICMP messages that might otherwise get buried in the system software. It reports, for example, if a router is declaring the target host unreachable.

Some routers may silently discard undeliverable packets. Others may believe a packet has been transmitted successfully when it has not been. (This is especially common over Ethernet, which does not provide link-layer acknowledgments) Therefore, ping may not always provide reasons why packets go unanswered.
Ping can not tell you why a packet was damaged, delayed, or duplicated. It can not tell you where this happened either, although you may be able to deduce it.
Ping can not give you a blow-by-blow description of every host that handled the packet and everything that happened at every step of the way. It is an unfortunate fact that no software can reliably provide this information for a TCP/IP network.

转载于:https://www.cnblogs.com/analylx/p/9597872.html