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DNS

DNS. hodduc@sparcs. 7. 기타 시스템 관리. 8. 네트워크 , TCP/IP. 9 . DNS. 10. NFS. 11. 프로그래밍 도구 및 쉘 프로그래밍. What is dns ?. What is DNS?. DNS Domain Name Service Domain Name System. What is DNS?. Q: “ara.kaist.ac.kr”? A: “143.248.234.103”. Translation services between two namespaces :

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DNS

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  1. DNS hodduc@sparcs

  2. 7. 기타 시스템 관리 8. 네트워크, TCP/IP 9. DNS 10. NFS 11. 프로그래밍 도구 및 쉘 프로그래밍 2010 Pre-wheel group seminar : hodduc@sparcs

  3. What is dns? 2010 Pre-wheel group seminar : hodduc@sparcs

  4. What is DNS? DNS Domain Name Service Domain Name System 2010 Pre-wheel group seminar : hodduc@sparcs

  5. What is DNS? Q: “ara.kaist.ac.kr”? A: “143.248.234.103” • Translation services between two namespaces : • Domain name hierachy • Internet Protocol (IP) address (IPv4, IPv6) “Go to 143.248.234.103” “Where is ara.kaist.ac.kr?” Your computer With ara Your computer DNS Q: “143.248.234.103”? A: “ara.kaist.ac.kr” 2010 Pre-wheel group seminar : hodduc@sparcs

  6. Domain Name Space 2010 Pre-wheel group seminar : hodduc@sparcs

  7. Domain Name Space Domain Name Space! (≠DNS ) Country-code top-level domains(ccTLD) Generic top-level domains (gTLD) Each node or leaf has 0 or more info about domain name (a.k.a Resource Records, RR) 2010 Pre-wheel group seminar : hodduc@sparcs

  8. DNS Zone 2010 Pre-wheel group seminar : hodduc@sparcs

  9. DNS Zone www.kaist.ac.kr = 143.248.5.102 ara.kaist.ac.kr = 143.248.234.103 hodduc.kaist.ac.kr = 143.248.234.77 …… 위임 Name Serverof “kaist.ac.kr” zone ns.kaist.ac.kr(143.248.1.177) Name Serverof “ac.kr” zone 위임 www.postech.ac.kr = 141.223.5.10 bric.postech.ac.kr = 141.223.114.1 …… 한국인터넷진흥원 Name Serverof “postech.ac.kr” zone ns.postech.ac.kr(141.223.1.2) 2010 Pre-wheel group seminar : hodduc@sparcs

  10. Naming Convention • FQDN(Full Qualified Domain Name) • 루트 도메인부터 해당 노드까지의 각 계층을 모두 표시 • 단, 계층과 계층 사이는 .으로 잇는다 • LDH rule : Letters(a-zA-Z), Digits(0-9), Hyphen • Case Insensitive • May not start or end with Hyphen 2010 Pre-wheel group seminar : hodduc@sparcs

  11. Naming Convention NO Is it valid? ara.kaist.ac.kr. Do not miss root domain! Question: Assume that system’s Default Host : kaist.ac.kr. Someone asks : “Please find hodduc.sparcs.org” 1. hodduc.sparcs.org.kaist.ac.kr ? 2. hodduc.sparcs.org ? 3. Attack japan? (…) Answer : 1. If user wants the second, user should have ask “Please find hodduc.sparcs.org.” ara.kaist.ac.kr 2010 Pre-wheel group seminar : hodduc@sparcs

  12. Resource Records 2010 Pre-wheel group seminar : hodduc@sparcs

  13. Resource Records 2010 Pre-wheel group seminar : hodduc@sparcs Name 도메인 네임(Key Index) TTL Time To Live. (on cache table) Class Deprecated (‘IN’ only) Type 리소스 레코드 유형 RDATA 실제 데이터. Type에 따라 다름

  14. Resource Types 물.론 훨씬 더 많지만.. 주로 사용하는 것은 정해져 있음. (나머지는 구글링!) 2010 Pre-wheel group seminar : hodduc@sparcs

  15. Resource Types 2010 Pre-wheel group seminar : hodduc@sparcs

  16. Protocol 2010 Pre-wheel group seminar : hodduc@sparcs

  17. 혹시나 해서… Protocol : 표준화된 통신규약 2010 Pre-wheel group seminar : hodduc@sparcs

  18. ara.kaist.ac.kr ㄱㄱ ara.kaist.ac.kr★☆★☆ara.kaist.ac.kr★☆★☆ ara.kaist.ac.kr★☆★☆ ara.kaist.ac.kr★☆★☆ ara.kaist.ac.kr★☆★☆ ara.kaist.ac.kr★☆★☆ ara.kaist.ac.kr★☆★☆ ara.kaist.ac.kr★☆★☆ Hobbac ㅡ.ㅡ? DNS ara.kaist.ac.kr واسمحوا Odduc Hotdog 2010 Pre-wheel group seminar : hodduc@sparcs

  19. DNS Lookups Port : UDP 53. 단 동일한 zone의 NS 동기화 등을 비롯해 큰 자료 전송시TCP 53 포트도 사용함 2010 Pre-wheel group seminar : hodduc@sparcs

  20. 감이 잘 안 오시죠? 직접 보여드립니다 2010 Pre-wheel group seminar : hodduc@sparcs

  21. 2010 Pre-wheel group seminar : hodduc@sparcs

  22. Dns Architecture 2010 Pre-wheel group seminar : hodduc@sparcs

  23. 2010 Pre-wheel group seminar : hodduc@sparcs

  24. Domain Querying .kr !! ac.kr !! .kr ? Kaist.ac.kr !! ara.kaist.ac.kr It is 143.248.234.103 2010 Pre-wheel group seminar : hodduc@sparcs

  25. Domain Update updated 2010 Pre-wheel group seminar : hodduc@sparcs

  26. Useful Tools about dns 2010 Pre-wheel group seminar : hodduc@sparcs

  27. Hosts 2010 Pre-wheel group seminar : hodduc@sparcs

  28. Hosts 2010 Pre-wheel group seminar : hodduc@sparcs

  29. Hosts 2010 Pre-wheel group seminar : hodduc@sparcs

  30. DNSEver 웹 기반 DNS 서버 개인이 직접 네임서버를 구축하기 어려운 경우(호스팅 계정이나 블로그에 도메인을 연결하는 경우 등) 2010 Pre-wheel group seminar : hodduc@sparcs

  31. Nslookup DNS Server lookup software Linux에도 있으나 이것만큼은 윈도우가.. Demo 2010 Pre-wheel group seminar : hodduc@sparcs

  32. Bind 이건 다음 세미나를 기대하시길.. ‘3’ Berkeley Internet Name Daemon 네임 서버 구축 프로그램 2010 Pre-wheel group seminar : hodduc@sparcs

  33. question 2010 Pre-wheel group seminar : hodduc@sparcs

  34. References • SPARCS seminar – pipoket-20090728 • En.wikipedia.org/Domain_Name_Service • “dns서버운영지침서.pdf” on http://dns.kisa.or.kr/main.jsp └강력 추천(무려 한글문서) 2010 Pre-wheel group seminar : hodduc@sparcs

  35. hodduc@sparcs Thank you! 2010 Pre-wheel group seminar : hodduc@sparcs

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