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Ping is the name of a computer network tool used on TCP/IP networks (such as the Internet). It provides a basic test of whether a particular host is operating properly and is reachable on the network from the testing host. Ping provides estimates of the round-trip time and packet loss rate between hosts. It works by sending ICMP “echo request” packets to the target host and listening for replies (ICMP “echo response” packets).
HistoryMike Muuss wrote the program in December, 1983, as a tool to troubleshoot odd behavior on an IP network. He named it after the pulses of sound made by a sonar, since its operation is analogous to active sonar in submarines, in which an operator issues a pulse of energy (a network packet) at the target, which then bounces from the target and is received by the operator. (Later David L. Mills provided a backronym, "Packet Internet Grouper (Groper)", also by other people "Packed Internet Gopher", after the small rodents ) The usefulness of ping in assisting the "diagnosis" of Internet connectivity issues was impaired from late in 2003, when a number of Internet Service Providers filtered out ICMP Type 8 (echo request) messages at their network boundaries. Internet worms such as Welchia flooded the Internet with ping requests as they sought to locate new hosts to infect, causing problems to routers across the Internet. Sample pingingThe following is a sample output of pinging www.google.com under linux with the iputils version of ping: $ ping www.google.com PING www.l.google.com (72.14.203.99) 56(84) bytes of data. 64 bytes from 72.14.203.99: icmp_seq=1 ttl=242 time=29.4 ms 64 bytes from 72.14.203.99: icmp_seq=2 ttl=242 time=28.1 ms 64 bytes from 72.14.203.99: icmp_seq=3 ttl=242 time=32.3 ms 64 bytes from 72.14.203.99: icmp_seq=4 ttl=242 time=26.6 ms 64 bytes from 72.14.203.99: icmp_seq=5 ttl=242 time=26.9 ms 64 bytes from 72.14.203.99: icmp_seq=6 ttl=242 time=27.0 ms 64 bytes from 72.14.203.99: icmp_seq=7 ttl=242 time=29.3 ms 64 bytes from 72.14.203.99: icmp_seq=8 ttl=242 time=27.5 ms 64 bytes from 72.14.203.99: icmp_seq=9 ttl=242 time=27.7 ms 64 bytes from 72.14.203.99: icmp_seq=10 ttl=242 time=28.8 ms --- www.l.google.com ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 9011ms rtt min/avg/max/mdev = 26.647/28.409/32.377/1.631 ms This output shows that www.google.com is a DNS CNAME record for www.l.google.com which then resolves to 72.14.203.99. The output then shows the results of making 10 pings to 72.14.203.99 with the results summarized at the end.
Pinging yahoo.comIn the early 1990s, many people began to ping yahoo.com when their internet connection seemed slow or dead. Many Internet Service Provider support technicians and simply tech-savvy individuals recommended pinging yahoo.com, creating this idea. It caught on, because in early 1990s, Yahoo was the primary hub of useful information and the domain name was already well known, and had a high uptime due to its then-unique use of Akamai load balancing. Today, other methods of checking connection speed and quality exist, such as traceroute or pinging other large sites such as google.com or bbc.co.uk, but due to the meme Yahoo has remained popular. See also
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