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Probing the Internet Keng Siau University of Nebraska-Lincoln Ping One of the simplest probing tools ping www.netbook.cs.purdue.edu Can be used to test whether a remote computer is alive Ping sends a message to specified computer wait a short time for a response

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Probing the internet l.jpg

Probing the Internet

Keng SiauUniversity of Nebraska-Lincoln


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Ping

  • One of the simplest probing tools

    • ping www.netbook.cs.purdue.edu

  • Can be used to test whether a remote computer is alive

    • Ping sends a message to specified computer

    • wait a short time for a response

    • if a response arrives, ping reports that the remote computer is alive


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Ping

  • Possible options

    • user can specify the size of the packet sent

    • compute the round trip time

    • repeatedly send one message per second until the program is stopped


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Traceroute

  • Use to determine the intermediate computers along the path to a remote computer

    • traceroute www.netbook.cs.purdue.edu

  • Provide more information than ping


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