Lab 2.2 - JuliaLightCNCS/Net-150 GitHub Wiki

In this lab we look at ethernet connections and default gateways. One tool I thought was useful was Wireshark. It is easy to use I. Observe a simple capture - Ping the Default Gateway

1. Capture a "ping" to the default gateway

On your Workstation, open a command prompt (Windows) or Terminal (Linux) Type "ipconfig /all" (Windows) or "ip route show" (Linux) and record the IP address of the default gateway Leaving the command prompt/terminalt open, start the Wireshark application In Wireshark, start a capture of the Ethernet interface Back in the command prompt, ping the Default Gateway IP address ping ip_address_of_gateway When ping ends, go to Wireshark and stop the capture

2. Inspect the results in Wireshark: Default Gateway Inspection Click on the ICMP Ping Request packet Record: What are the source and destination MAC addresses (Not IP Addresses) SCREEN CAPTURE TIP: You can filter for ICMP by typing "ICMP" in the Wireshark Display Filter and hitting the "arrow" to apply Click on the ICMP Ping Response packet Record: What are the source and destination MAC addresses SCREEN CAPTURE Question: What is the MAC address of your workstation's NIC? What is the MAC address of the Default Gateway Router interface (NIC)?

II. Observe a simple capture - Ping outside LAN IP addresses Repeat the Wireshark capture of a ping - but this time use https://www.timeslive.co.za What is the first IPv4 IP address from the site? SCREEN CAPTURE Inspect the results in Wireshark Click on the ICMP Ping Request packet Record: What are the source and destination MAC addresses SCREEN CAPTURE