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TCP/IP Guide by Charles M. Kozierok

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TCP/IP Communication Verification Utility (ping)

One of the most common problems that network administrators are asked to solve is that two hosts are not able to communicate. For example, a user on a corporate network might not be able to retrieve one of his files from a local server, or another user might be having difficulty loading her favorite website. In these and similar situations, one important step in diagnosing the problem is to verify that basic communication is possible between the TCP/IP software stacks on the two machines. This is most often done using the ping utility, or ping6 in Internet Protocol version 6 (IPv6) implementations. The IPv6 version of ping works in much the same way as IPv4 ping, but ping6's options and parameters ...

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