Select an interface for Wireshark for capturing packets. Note: If Wireshark is not yet installed, it can be downloaded at. Click the Windows Start button and navigate to the Wireshark program. Use Wireshark to Capture DNS Queries and Responses In Part 2, you will set up Wireshark to capture DNS query and response packets to demonstrate the use of UDP transport protocol while communicating with a DNS server. Lab - Using Wireshark to Examine a UDP DNS Capture The information will be used in the following parts of this lab with packet analysis. Record this information in the table provided. Record a PC’s IP Configuration Information 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’s network interface card (NIC), the IP address of the specified default gateway, and the DNS server IP address specified for the PC. Required Resources 1 PC (Windows 7, Vista, or XP with a command prompt access, Internet access, and Wireshark installed) This lab assumes that you have Internet access. Note: This lab cannot be completed using Netlab. You will use Wireshark to examine the DNS query and response exchanges with the name 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’s DNS server query and the DNS server’s 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’s IP address. DNS is a distributed network of servers that translates user-friendly domain names like to an IP address. Objectives Part 1: Record a PC’s IP Configuration Information Part 2: Use Wireshark to Capture DNS Queries and Responses Part 3: Analyze Captured DNS or UDP Packetsīackground / Scenario If you have ever used the Internet, you have used the Domain Name System (DNS). Lab - Using Wireshark to Examine a UDP DNS Capture Topology
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