Click Stop to stop the Wireshark capture when you see Google’s home page.In the Wireshark window, select and double-click enp0s3 from the interface list.In the terminal window, start Wireshark and click OK when prompted.This will demonstrate the use of the UDP transport protocol while communicating with a DNS server. In Part 2, you will set up Wireshark to capture DNS query and response packets. Part 2: Use Wireshark to Capture DNS Queries and Responses However, in a business or school network, the addresses would most likely be different. Note : The DNS IP address and default gateway IP address are often the same, especially in small networks. At the terminal prompt, enter cat /etc/nf to determine the DNS server.TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Note: In Part 1, your results will vary depending on your local area network settings and internet connection. ~]$ sudo /scripts/configure_as_dhcp.shĬonfiguring the NIC to request IP info via DHCP... If you do not have an IP address on your local network, run the following command in the terminal: Enter ifconfig at the prompt to display interface information. To check your network settings go to: Machine > Settings, select Network, the tab Adapter 1, Attached to: Bridged Adapter. Your CyberOps Workstation VM network settings should be set to bridged adapter.The information will be used in parts of this lab with packet analysis. Record this information in the table provided.
WIRESHARK FILTER DNS QUERY NAME CONTAINS MAC
In Part 1, you will use command s on your CyberOps Workstation VM to find and record the MAC and IP address es of your VM’ s virtual network interface card ( NIC ), the IP address of the specified default gateway, and the DNS server IP address specified for the PC. Instructions Part 1: Record VM’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. You will use Wireshark to examine the DNS query and response exchanges with the same server.Īnswers Note : Using a packet sniffer, such as Wireshark, may be considered a breach of the security policy of the school. 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 query and the DNS server’s response make use of the User Datagram Protocol (UDP) as the transport layer protocol.
WIRESHARK FILTER DNS QUERY NAME CONTAINS PC
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. When you use the internet, you use the Domain Name System (DNS). Part 3: Analyze Captured DNS or UDP Packets Background / Scenario Part 1: Record a PC’s IP C onfiguration Information Lab – Using Wireshark to Examine a UDP DNS Capture (Answers Version)Īnswers Note : Red font color or g ray highlights indicate text that appears in the instructor copy only.