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

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 www.gouv.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 www.afrinic.netwww.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 QNAME QCLASS QTYPE www.afrinic.netwww.afrinic.net IN A

7. 7 Name Servers AfriNIC 11 – DNS Operations 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.

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