Lab 2‐2 ‐ Observing LAN Activity - rune-seregina/net-150-sp24 GitHub Wiki

What was this lab's objective?

The objective of this lab was to explore the difference and relationship between MAC addresses and IP addresses as well as learn observe the terminology and the function of the OSI model as it is implemented using a packet capturing tool (Wireshark). By pinging a device in the LAN and a device outside of the LAN I observed and drew conclusions about the function of MAC addresses.

  • NIC- Network Interface Card
  • See Lecture Notes 1/29/2024 for more info

One question that arose during my lab was the MAC address of the device within the LAN and the device outside of the LAN having the same MAC address. While this will be discussed next lecture, I assume this is an observation meant to lead to the conclusion that MAC addresses are only used within the LAN so the default gateway is the MAC address used to reach the final destination of the IP address.

Capture a "ping" to the default gateway

Type "ipconfig /all" (Windows) or "ip route show" (Linux) and record the IP address of the default gateway
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Inspect the results in Wireshark: Default Gateway Inspection

Ping request: What are the source and destination MAC addresses (Not IP Addresses) SCREEN CAPTURE

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Ping reply: What are the source and destination MAC addresses SCREEN CAPTURE

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Question: What is the MAC address of your workstation's NIC? What is the MAC address of the Default Gateway Router interface (NIC)?

  • The MAC address of my workstation's NIC is 00:0c:29:92:68:59
  • The MAC address of my Default Gateway Router interface is d0:81:c5:23:bd:80

Repeat the Wireshark capture of a ping - but this time use www.timeslive.co.za.

What is the first IPv4 IP address from the site? SCREEN CAPTURE

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The IP address for this site is 142.250.65.179

Inspect the results in Wireshark

Record: What are the source and destination MAC addresses SCREEN CAPTURE

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