Go to Wireshark.org and download Wireshark for Mac OS (or Windows OS if you are using Windows), then install. Detailed instructions for configuring Wireshark can be found on the website. Also, remember that your second textbook in this course is Wireshark Essentials on O'Reilly. Ensure the correct network interface has been selected prior to starting packet capture (wireless adapter). 1. Start up your web browser and go to: http://gaia.cs.umass.edu/wiresharklabs/alice.txt 2. Retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer (make sure you can find it). To do this, right click (outside of the text, in the white area, and select save as..) it should be saving as "alice.txt" - the upload server will not take anything other than this file name. 3. Next go to: http://gaia.cs.umass.edu/wireshark-labs/TCP-wireshark-file1.html 4. Use the Browse button in this form to enter the name of the file (full path name) on your computer containing Alice in Wonderland (or do so manually). 5. Don't press the "Upload alice.txt file" button yet - it is best to close down any other network applications, and try to make sure there is as little extraneous network traffic occurring (this will obfuscate your ability to find the correct packets). 6. Now start up Wireshark and begin packet capture (go to Capture > Start, or if you are already in the capture window, press the "shark fin" button on the top-left to begin the trace). 7. Return to your browser, press the “Upload alice.txt file” button to upload the file to the gaia.cs.umass.edu server. 8. Once the file has been uploaded, a short congratulations message will be displayed in your browser window. 8. Once the file has been uploaded, a short congratulations message will be displayed in your browser window. 9. Stop Wireshark packet capture. 10. Filter the packets displayed in the Wireshark window by entering "tcp” (the filter window is at the top of the packet capture screen) 11. What you should see is series of TCP and HTTP messages between your computer and gaia.cs.umass.edu. You should see the initial three-way handshake containing the SYN/SYN-ACK/ACK messages transmitting. 12. Use the packet trace information to answer the following questions: Provide the screenshot of the packet trace information you used to answer the questions. Questions: 1. What is the IP address used by your computer (source)? 2. On what port number is your computer sending and receiving TCP segments for this connection? 3. What is the IP address of gaia.cs.umass.edu? (Destination) 4. On what port number is gaia.cs.umass.edu sending and receiving TCP segments for this connection?

Go to Wireshark.org and download Wireshark for Mac OS (or Windows OS if you are using Windows), then install. Detailed instructions for configuring Wireshark can be found on the website. Also, remember that your second textbook in this course is Wireshark Essentials on O'Reilly. Ensure the correct network interface has been selected prior to starting packet capture (wireless adapter). 1. Start up your web browser and go to: http://gaia.cs.umass.edu/wiresharklabs/alice.txt 2. Retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer (make sure you can find it). To do this, right click (outside of the text, in the white area, and select save as..) it should be saving as "alice.txt" - the upload server will not take anything other than this file name. 3. Next go to: http://gaia.cs.umass.edu/wireshark-labs/TCP-wireshark-file1.html 4. Use the Browse button in this form to enter the name of the file (full path name) on your computer containing Alice in Wonderland (or do so manually). 5. Don't press the "Upload alice.txt file" button yet - it is best to close down any other network applications, and try to make sure there is as little extraneous network traffic occurring (this will obfuscate your ability to find the correct packets). 6. Now start up Wireshark and begin packet capture (go to Capture > Start, or if you are already in the capture window, press the "shark fin" button on the top-left to begin the trace). 7. Return to your browser, press the “Upload alice.txt file” button to upload the file to the gaia.cs.umass.edu server. 8. Once the file has been uploaded, a short congratulations message will be displayed in your browser window. 8. Once the file has been uploaded, a short congratulations message will be displayed in your browser window. 9. Stop Wireshark packet capture. 10. Filter the packets displayed in the Wireshark window by entering "tcp” (the filter window is at the top of the packet capture screen) 11. What you should see is series of TCP and HTTP messages between your computer and gaia.cs.umass.edu. You should see the initial three-way handshake containing the SYN/SYN-ACK/ACK messages transmitting. 12. Use the packet trace information to answer the following questions: Provide the screenshot of the packet trace information you used to answer the questions. Questions: 1. What is the IP address used by your computer (source)? 2. On what port number is your computer sending and receiving TCP segments for this connection? 3. What is the IP address of gaia.cs.umass.edu? (Destination) 4. On what port number is gaia.cs.umass.edu sending and receiving TCP segments for this connection?