COMP 3630 - The Internet

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COMP 3630 - The Internet

• Name Dr. Joseph NG
• Office R707 (Run Run Shaw Building)
• Phone [phone]
• Email jng_at_comp.hkbu.edu.hk
• HomePage http//www.comp.hkbu.edu.hk/jng
• ICQ I am not going to tell you!
• Planned Conference Trip
• November 30 --- December 5 (Phoenix, Arizona,
  U.S.A.)
• Guest Lecture by Mr. Y. K. Chan on December 3.

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COMP 3630 - The Internet

• Subject Contents (4 weeks left)
• The Cyber Map Project
• Use of ping, traceroute from UNIX, and tracert
  from NT
• Internet application using cgi or perl
• Internet Applications Case Studies
• Search Engines (Yahoo vs. Lycos)
• Interactive TV (iTV)
• Emerging Technologies leading to Electronic
  Commerce
• Hands-on Experience for PGP (Y.K. Chan)

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COMP 3630 - The Internet

• The Cyber Map Project
• Project Descriptions
• Given the host address of the Top-22 Universities
  in U.S.A.
• Use traceroute (unix) or tracert (NT) to find out
  the routes from HKBU to each of the address and
  record the gateways in between
• Using the ping command to estimate the round trip
  delay from HKBU to each gateway
• Construct a graph to represent the connectivity
  between HKBU and these 25 Universities
• The graph is updated automatically and
  periodically
• The delay and connectivity information is made
  available through a web page

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COMP 3630 - The Internet

• The Cyber Map Project
• Top-22 Universities of U.S.A.
• http//www.usnews.com/usnews/edu/college/rankings/
  cat13wi.htm (courtesy to US News)

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COMP 3630 - The Internet

• The Cyber Map Project
• Useful commands from unix and Windows NT
• ping -- ping utilizes the ICMP protocol's
  ECHO_REQUEST datagram to elicit an ICMP
  ECHO_RESPONSE from the specified host or network
  gateway.
• traceroute -- traceroute in unix and tracert in
  Windows NT provide the same function. Traceroute
  utilizes the IP protocol time to live' field
  and attempts to elicit an ICMP TIME_EXCEEDED
  response from each gateway along the path to some
  host.
• netstat -- netstat basically shows the network
  status. Depending on the options you select, it
  displays the state of all sockets and all routing
  table entries normally only interface, host,
  network and default routes are shown.
• Note consult the man pages for these commands.

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COMP 3630 - The Internet

• The Cyber Map Project
• Use Yahoo or Lycos and search for traceroute and
  related applications and see if you have any new
  idea in working on your Cyber Map project.
• For Examples (from Lycos)
• NeoTrace
• GTrace
• VisualRoute
• Cybergeography -- a cool site (http//www.cybergeo
  graphy.org/)
• Article MAPPING THE INTERNETWITH TRACEROUTE
  by Jack Rickard
• Type in traceroute from Yahoo will give you a
  list of traceroute servers.

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COMP 3630 - The Internet

• The Cyber Map Project
• Programming
• Although you can easily find the source code of
  ping and traceroute from the web or from the
  book unix network programming by Richard
  Stevens, you may want to do the project in a
  quick and dirty way by simply writing a C program
  with and make use of the system call.
• So call traceroute from your program and redirect
  the output to a tmp file, and later on read back
  this tmp file and get the gateway information.
• Use ping to update the delay information
  automatically and periodically.
• Design a simple web page for query.