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Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network and to measure the round-trip time for messages sent from the originating host to a destination computer and back. The name comes from active sonar terminology that sends a pulse of sound and listens for the echo to detect objects underwater;〔 however, the acronym "PING" meaning "Packet InterNet Groper" has been in use since early days in computing for testing and measuring networks and the Internet. Ping operates by sending Internet Control Message Protocol (ICMP) echo request packets to the target host and waiting for an ICMP echo reply. It measures the round-trip time from transmission to reception, reporting errors and packet loss. The results of the test usually include a statistical summary of the response packets received, including the minimum, maximum, the mean round-trip times, and usually standard deviation of the mean. The command-line options for the utility and its output vary depending on implementation. Options may include the size of the payload, count of tests, and limits for the number of hops (TTL) that probes traverse. Many systems provide a companion utility , for similar testing on Internet Protocol version 6 (IPv6) networks. ==History== The ping utility was written by Mike Muuss in December 1983 as a tool to troubleshoot problems in an IP network. He was inspired by a remark by David Mills on using ICMP echo packets for IP network diagnosis and measurements.〔("The Story of the PING Program" ), Mike Muuss〕 The author named it after the sound that sonar makes, since its methodology is similar to sonar's echo location. RFC 1122 prescribes that any host must process an echo-request and issue an echo-reply in return.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ping (networking utility)」の詳細全文を読む スポンサード リンク
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