Select (highlight) the active capturing interface. Select an interface for Wireshark to capture packets.Click the Windows Start button and navigate to the Wireshark program.In Part 2, you will set up Wireshark to capture DNS query and response packets to demonstrate the use of the UDP transport protocol while communicating with a DNS server. The information will be used in parts of this lab with packet analysis. Record this information in the table provided. In Part 1, you will use the ipconfig /all command on your local PC to find and record the MAC and IP addresses of your PC network interface card (NIC), the IP address of the specified default gateway, and the DNS server IP address specified for the PC. Required Resourcesġ PC (Windows 7, 8, or 10 with command prompt access, internet access, and Wireshark installed) Part 1: Record a PC’s IP Configuration Information If using a packet sniffer is an issue, the instructor may wish to assign the lab as homework or perform a walk-through demonstration. It is recommended that permission be obtained before running Wireshark for this lab. This lab assumes that you have internet access.Īnswers Note: Using a packet sniffer, such as Wireshark, may be considered a breach of the security policy of the school. Note: This lab cannot be completed using Netlab. You will use Wireshark to examine the DNS query and response exchanges with the same server. In this lab, you will communicate with a DNS server by sending a DNS query using the UDP transport protocol.
DNS queries and responses are very small and do not require the overhead of TCP. UDP is connectionless and does not require a session setup as does TCP. Your PC DNS server query and the DNS server response make use of the User Datagram Protocol (UDP) as the transport layer protocol. When you type a website URL into your browser, your PC performs a DNS query to the DNS server IP address. DNS is a distributed network of servers that translates user-friendly domain names like to an IP address. If you have ever used the internet, you have used the Domain Name System (DNS). Part 3: Analyze Captured DNS or UDP Packets Background / Scenario Part 2: Use Wireshark to Capture DNS Queries and Responses Part 1: Record the IP Configuration Information of a PC Last Updated on Januby Admin 9.2.3.5 Lab – Using Wireshark to Examine a UDP DNS Capture Answers Lab – Using Wireshark to Examine a UDP DNS Capture ( Answers Version)Īnswers Note: Red font color or gray highlights indicate text that appears in the instructor copy only.
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