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DNS Failover

DNS Failover. Presenter: Tim McAdoo Date: 04/17/2007. Introduction. Define Failover Queries Caching Registrars Other Protocols. Definition Failover. Failover vs. Fall-over. DNS Query Flow. DNS Caching. Caching levels Expiration. Domain Registrars. Registrars WHOIS records

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DNS Failover

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  1. DNS Failover Presenter: Tim McAdoo Date: 04/17/2007

  2. Introduction • Define Failover • Queries • Caching • Registrars • Other Protocols Presenter: Tim McAdoo Topic: DNS Failover

  3. Definition Failover • Failover vs. Fall-over Presenter: Tim McAdoo Topic: DNS Failover

  4. DNS Query Flow Presenter: Tim McAdoo Topic: DNS Failover

  5. DNS Caching • Caching levels • Expiration Presenter: Tim McAdoo Topic: DNS Failover

  6. Domain Registrars • Registrars • WHOIS records • Service updates Presenter: Tim McAdoo Topic: DNS Failover

  7. Example WHOIS Record >whois odu.edu Whois Server Version 1.3 Domain names in the .com and .net domains can now be registered with many different competing registrars. Go to http://www.internic.net for detailed information. Domain Name: ODU.EDU Registrar: EDUCAUSE Whois Server: whois.educause.net Referral URL: http://www.educause.edu/edudomain Name Server: NS1.ODU.EDU Name Server: NS2.ODU.EDU Name Server: NS2.WM.EDU Name Server: NS1.WM.EDU Status: ok Updated Date: 06-nov-2006 Creation Date: 05-nov-1986 Expiration Date: 05-nov-2007 >>> Last update of whois database: Sun, 15 Apr 2007 20:20:55 UTC <<< NOTICE: The expiration date displayed in this record is the date the registrar's sponsorship of the domain name registration in the registry is currently set to expire. This date does not necessarily reflect the expiration date of the domain name registrant's agreement with the sponsoring registrar. Users may consult the sponsoring registrar's Whois database to view the registrar's reported date of expiration for this registration. Presenter: Tim McAdoo Topic: DNS Failover

  8. NS Failover • Multiple NS records per domain • WHOIS change rate Presenter: Tim McAdoo Topic: DNS Failover

  9. NS Lookup Examples Non-authoritative answer: cs.odu.edu nameserver = ns1.cs.odu.edu cs.odu.edu nameserver = ns1.odu.edu cs.odu.edu nameserver = ns2.cs.odu.edu ns1.cs.odu.edu internet address = 128.82.4.36 ns2.cs.odu.edu internet address = 128.82.4.1 Authoritative answer: cs.odu.edu nameserver = ns1.cs.odu.edu cs.odu.edu nameserver = ns2.cs.odu.edu cs.odu.edu nameserver = ns1.odu.edu ns1.cs.odu.edu internet address = 128.82.4.36 ns2.cs.odu.edu internet address = 128.82.4.1 ns1.odu.edu internet address = 128.82.224.101 Presenter: Tim McAdoo Topic: DNS Failover

  10. Other Failovers • SMTP MX Records • Enterprise organizations • Keeps e-mail running Presenter: Tim McAdoo Topic: DNS Failover

  11. SMTP Diagram Normal Operations Failover Mode Presenter: Tim McAdoo Topic: DNS Failover

  12. Summary • Defined Failover • Query Process • Caching Levels • Registrars and WHOIS • Other Protocols Presenter: Tim McAdoo Topic: DNS Failover

  13. Questions and Answers? Presenter: Tim McAdoo Topic: DNS Failover

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