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NSLOOKUP

NSLOOKUP. CNIT 102 Substitute lecture 3-6-14 Sam Bowne. Domain Name System. Converts a domain name like www.ccsf.edu to an IP address like 147.144.1.212. Wireshark. Shows traffic going to server at 147.144.1.212. DNS Resolution. Packets in Wireshark show DNS Query and DNS Response.

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NSLOOKUP

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  1. NSLOOKUP CNIT 102 Substitute lecture 3-6-14 Sam Bowne

  2. Domain Name System • Converts a domain name like www.ccsf.edu • to an IP address like 147.144.1.212

  3. Wireshark • Shows traffic going to server at 147.144.1.212

  4. DNS Resolution • Packets in Wireshark show DNS Query and DNS Response

  5. NSLOOKUP • Performs a DNS resolution • Without loading a Web page • Useful to test DNS operations • Simplest way • nslookup domain.com

  6. NSLOOKUP in Interactive Mode

  7. Specify Server

  8. Free Public Servers • Google • 8.8.8.8 • 8.8.4.4 • OpenDNS • 208.67.222.222 • 208.67.220.220

  9. Set Querytype • aaaa = IPv6

  10. What NSLOOKUP Does • First it tries to find the domain on your local network • Then it tries the Internet

  11. Debug Mode

  12. Clearing the DNS Cache

  13. Setting the DNS Server • Start, type CONNECTIONS in Search box • Click "View network connections" • Right-click "Local Area Connection" • Click Properties • Double-click "Internet Protocol Version 4 (TCP/IPv4)"

  14. Setting the DNS Server • Must click "OK" twice for settings to take effect

  15. Viewing the DNS Server in the Command Line • IPCONFIG /ALL

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