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