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DNS Operations

AfriNIC 11 November 2009. DNS Operations. S. Moonesamy Eland Systems sm+afrinic@elandsys.com. 1. Domain Name System. Lookup service. Globally unique public name space. AfriNIC 11 – DNS Operations. 2. DNS Tree. com org net cm tg sn za. afrinic.net. gouv.sn. www.gouv.sn.

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DNS Operations

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  1. AfriNIC 11 November 2009 DNS Operations S. Moonesamy Eland Systems sm+afrinic@elandsys.com 1

  2. Domain Name System Lookup service Globally unique public name space AfriNIC 11 – DNS Operations 2

  3. DNS Tree com org net cm tg sn za afrinic.net gouv.sn www.gouv.sn AfriNIC 11 – DNS Operations 3

  4. Domain names Hostname [A – Z] [0 – 9] hyphen US ASCII IDN AfriNIC 11 – DNS Operations 4

  5. Terminology DNS label www . gouv . sn DNS Zone www . afrinic . netmeeting . afrinic . net AfriNIC 11 – DNS Operations 5

  6. DNS Query QNAME QCLASS QTYPE www.afrinic.net IN A dig -t A www.afrinic.net ;; QUESTION SECTION: ;www.afrinic.net. IN A ;; ANSWER SECTION: www.afrinic.net. 86400 IN A 196.216.2.1 ;; Query time: 80 msec ;; MSG SIZE rcvd: 340 AfriNIC 11 – DNS Operations 6

  7. Name Servers dig -t ns sn ;; QUESTION SECTION: ;sn. IN NS ;; ANSWER SECTION: sn. 67264 IN NS ns.sentoo.sn. sn. 67264 IN NS ns-sn.ripe.net. sn. 67264 IN NS ns1.ird.fr. sn. 67264 IN NS ns3.nic.fr. sn. 67264 IN NS ns.ucad.sn. AfriNIC 11 – DNS Operations 7

  8. Transport Protocols UDP 512 octet payload TCP AfriNIC 11 – DNS Operations 8

  9. EDNS0 Extension Mechanism for DNS allows the transport of larger DNS packets over UDP AfriNIC 11 – DNS Operations 9

  10. What could go wrong? Root servers Authoritative servers misconfiguration firewalls Unreachable servers Domain Name Registry AfriNIC 11 -DNS Operations 10

  11. DNS Operations Thank you AfriNIC 11 – DNS Operations 10

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