Domain Name System

Without DNS, the Internet would be unthinkable today. The people would have to remember dozens of IP addresses, to visit a few websites. To solve this problem, the domain name system was invented. This presentation gives an overview of the technology and its use.

Ohne DNS wäre das heutige Internet undenkbar. Die Menschen müssten sich dutzende IP-Adressen merken, um ein paar Webseiten zu besuchen. Um dieses Problem zu lösen, wurde das Domain Name System erfunden. Dieser Vortrag gibt einen Überblick über die Technologie und deren Verwendung.

Video: https://vimeo.com/99019447

Transcript

1. Domain Name System .de .com .net .org .eu .biz . .us .io .space .vu .tv .xxx .im .it .cat
2. @andreaspfohl
3. Domain Name System .de <code>
4. Domain Names that’s what you see
5. www.example.com
6. www.example.com www.example.com.
7. www.example.com www.example.com. www.example.com.<empty>
8. www.example.com www.example.com.
9. .
10. . org . com
11. . org com example google fsfe freebsd com.
12. example.com. . com org example google fsfe freebsd www www www ftp www
13. . com org example google fsfe freebsd www www www ftp www www.example.com.
14. Subdomains Locations md.freifunk.net kbu.freifunk.net berlin.freifunk.net hamburg.freifunk.net
15. Subdomains Services www.netz39.de ftp.netz39.de mail.netz39.de jabber.netz39.de
16. Subdomains Faculties cs.ovgu.de fmb.ovgu.de med.ovgu.de math.ovgu.de
17. Subdomains Reverse DNS 20.22.46.78.in-addr.arpa. netz39.de
18. Subdomains Reverse DNS 20.22.46.78.in-addr.arpa. netz39.de extreme subdomaining
19. The three Rs
20. The three Rs Registries
21. The three Rs Registries Registrars
22. The three Rs Registries Registrars Registrants
23. The three Rs Registries Registrars Registrants (that’s you)
24. System that’s for computers
25. Components
26. Components Nameserver
27. Components Nameserver Resolver
28. Components Nameserver Resolver Client
29. Components Nameserver Resolver Client Protocol
30. Components Nameserver Resolver Client Protocol
31. Components Nameserver Resolver Client Protocol 53
32. Records
33. Records
34. Records A AAAA SOA NS MX PTR TXT SRV DS RRSIG DNSKEY SPF TLSA SSHFP CNAME
35. Records netz39.de. 3600 IN SOA ns1.domaindiscount24.net. tech.key- systems.net. 2013110307 10800 3600 604800 28800
36. Records netz39.de. 3600 IN A 78.46.22.20
37. Records netz39.de. 3600 IN A 78.46.22.20 netz39.de. 3600 IN MX mail.netz39.de.
38. Records netz39.de. 3600 IN A 78.46.22.20 netz39.de. 3600 IN MX mail.netz39.de. mail 3600 IN MX @
39. Resolving that’s how you get your ips
40. netz39.de.
41. browser netz39.de.
42. browser syscall OS netz39.de.
43. browser syscall OS /etc/hosts netz39.de.
44. browser syscall OS resolv.conf resolver netz39.de.
45. browser syscall OS resolv.conf resolver cache netz39.de.
46. browser syscall OS resolv.conf resolver req root ns . netz39.de.
47. browser syscall OS resolv.conf resolver req root ns . netz39.de. ns de.
48. browser syscall OS resolv.conf resolver netz39.de. ns de. req
49. browser syscall OS resolv.conf resolver netz39.de. ns de. req ns netz39.de.
50. browser syscall OS resolv.conf resolver netz39.de. ns netz39.de. req
51. browser syscall OS resolv.conf resolver netz39.de. ns netz39.de. req IP
52. browser syscall OS resolv.conf resolver netz39.de. IP
53. browser syscall OS resolv.conf resolver netz39.de. IP
54. browser syscall OS resolv.conf resolver netz39.de. IP
55. Thanks. theme and colors stolen from @holman
56. Andreas Pfohl twitter: @andreaspfohl github: @apfohl netz39.de./events/vortraege visit the dns workshop later this summer