![]() The destination port for the DNS query message is 53. What is the destination port for the DNS query message? What is the source port The GET commands for the images, highlighted in black, do not have the UDP query & response that are characteristics of DNS queries.ġ1. ![]() Before retrieving each image, does your host issue new DNS queries? The TCP SYN packet’s destination IP address (64.170.98.30.) corresponds to the server in the DNS response message in (8) above.ġ0. Does the destination IP address of the SYN packet correspond to any of the IP addresses provided in the DNS response message? Consider the subsequent TCP SYN packet sent by your host. The ‘answers’ mentioned refer to the Answer Resource Records, or RRs, of which there is only one: it is a Type A (address) RR that maps a Fully Qualified Domain Name (FQDN), in this case,, to an IP address, in this case, 64.170.98.30.ĩ. The query states it desires recursive querying, and states it wants authoritative answers only.Ĩ. The query is sent to destination IP address 156.154.119.11. To what IP address is the DNS query message sent? Use ipconfig to determine the The source port is 53, contained in the same menu.Ħ. The destination port, contained in the collapsible UDP menu is 53. The DNS query response is sent over Transmission Control Protocol.ĥ. The DNS standard query uses User Datagram Protocol to contact the IETF server at 64.170.98.30. Locate the DNS query and response messages. This filter removes all packets that neither originate nor are destined to your host. ![]() (With Internet Explorer, go to Tools menu and select Internet Options then in the General tab select Delete Files.) Open Wireshark and enter “ip.addr = your_IP_address” into the filter, where you obtain your_IP_address with ipconfig. Open your browser and empty your browser cache. Use ipconfig to empty the DNS cache in your host. Run nslookup so that one of the DNS servers obtained in Question 2 is queried for The authoritative DNS servers for the Oxford University (are dns0.ox.ac.uk, dns1.ox.ac.uk and dns3.ox.ac.uk.ģ. Run nslookup to determine the authoritative DNS servers for a university in The IP address for the web server for the Asian Institute of Technology ( ) is 92.242.144.7.Ģ. Run nslookup to obtain the IP address of a Web server in Asia.Here is the Wireshark Lab on detailed nslookup.
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