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DNS Operations S. Moonesamy Eland Systems AfriNIC 11 November 2009 1.

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Presentation on theme: "DNS Operations S. Moonesamy Eland Systems AfriNIC 11 November 2009 1."— Presentation transcript:

1 DNS Operations S. Moonesamy Eland Systems AfriNIC 11 November

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

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

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

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

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

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

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

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

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

11 DNS Operations 10 Thank you AfriNIC 11 – DNS Operations


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