Computer Networking.  The basic tool for observing the messages exchanged between executing protocol entities  Captures (“sniffs”) messages being sent/received.

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Presentation transcript:

Computer Networking

 The basic tool for observing the messages exchanged between executing protocol entities  Captures (“sniffs”) messages being sent/received from/by your computer  Store and/or display the contents of the various protocol fields in these captured messages

 The packet capture library receives a copy of every link-layer frame that is sent from or received by your computer.  The packet analyzer displays the contents of all fields within a protocol message.

 Download and install the Wireshark software:  Windows PortableApps (32-bit)

1. Start up your favorite web browser 2. Start up the Wireshark software 3. To begin packet capture, select the Capture pull down menu and select Options 4. Select an interface that is being used to send and receive packets, click Start 5. Once you begin packet capture, a packet capture summary window will appear

6. Enter the URL: labs/INTRO-wireshark-file1.html labs/INTRO-wireshark-file1.html 7. Stop Wireshark packet capture by selecting stop in the Wireshark capture window. 8. Type in “http” into the display filter specification window, then select Apply 9. Select the first http message shown in the packet-listing window

1. List the different protocols that appear in the protocol column in the unfiltered packet-listing window in step 7 above. 2. How long did it take from when the HTTP GET message was sent until the HTTP OK reply was received? 3. What is the Internet address of the gaia.cs.umass.edu? What is the Internet address of your computer?