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MIS 251: Networking Fundamentals Wireshark Lab: Command-Line Tools

Instructions: In this lab you will use Wireshark to view the command line tools used to troubleshoot different networking issues. You will issue all commands during the same packet capture and answer questions based on your capture. Before you start, make sure all windows are closed, other than Wireshark and these instructions. Extra web services will generate additional traffic, making it more difficult to navigate through the Wireshark packets

Step 1: Capture Packets a. Close all applications except these instructions

. b. Open Wireshark and start a packet capture with the network device youre using to connect to the Internet.

c. Open a command prompt or terminal and issue the following commands (note: you may need to adjust your commands depending on your OS):" i have windows "

1. ipconfig /release

2. ipconfig /renew

i. wait until this command completes before moving to the next command

ii. sometimes DHCP renewals will hang if you have multiple NICs '

3. ping default-gateway i. replace default-gateway with the IP address of your default gateway

4. nslookup www.google.com

5. tracert google-ip-address

i. Replace google-ip-address with the IP address found using nslookup

d. Open a web browser and stream a video from YouTube.com. The video doesnt matter, but make sure it has about 5 minutes of runtime.

e. After issuing all commands, click the Stop icon in Wireshark.

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Step 2: Examine Packets & Answer Questions

1. In Wireshark, use the display filter to filter out the DHCP ipconfig commands.

a. What filter did you apply?

b. List the 5 different packets related to the ipconfig /release and ipconfig /renew commands and explain the purpose of each packet.

c. What is the source IP address when sending a DHCP request?

d. What options are sent with the DHCP offer? Explain the purpose of each option.

e. What is the purpose of padding at the end of DHCP messages?

2. Clear your DHCP filter and apply a filter to view your ping echo requests and replies.

a. What filter did you apply?

b. What data is sent with an echo request?

3. Clear your filter and apply a new filter to view your nslookup packets. Note: your filter must filter out all packets except your response packet(s) for www.google.com. In other words, you should only see one or two results.

a. What filter did you apply?

b. What type(s) of DNS records did your computer receive?

c. What is the IPv6 address of www.google.com?

4. Clear your filter and apply a new filter to view your tracert packets.

a. What filter did you apply?

b. What protocol was used throughout tracert?

c. How many real replies were received?

i. Hint: real replies gave you router information, to include IP addresses.

5. What is the purpose of using ipconfig /release and ipconfig /renew? Explain.

6. What is the purpose of the ping command? Explain.

7. What is the purpose of the nslookup command? Explain.

8. What is the purpose of the tracert command? Explain.

9. Using the tools available in Wireshark, clear any filters and look for traffic statistics.

a. What was the average bytes per second on your capture?

b. List the top two protocols discovered in your capture. Explain why these two packets are most common.

c. What source IP address delivered the most amount of content to your device?

d. Keeping the entire capture in mind, provide a detailed explanation of how all of this information can be useful in regards to network troubleshooting.

done

thank you so much