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DNS Domain Name System

DNS Domain Name System. `09 Summer Wheel Seminar. SPARCS `08 서우석 ( pipoket ). TCP/IP. 143.248.246.144. Think about this. 202.131.29.70 74.125.67.100 203.226.253.11 211.115.77.211 143.248.234.102 Can you remember all?. Domain Name. MAP IP with “Domain”. 143.248.246.144.

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DNS Domain Name System

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  1. DNS Domain Name System `09 Summer WheelSeminar SPARCS `08 서우석(pipoket) SPARCS

  2. TCP/IP 143.248.246.144 SPARCS

  3. Think about this 202.131.29.70 74.125.67.100 203.226.253.11 211.115.77.211 143.248.234.102 Can you remember all? SPARCS

  4. Domain Name MAP IP with “Domain” 143.248.246.144 sparcs44.kaist.ac.kr SPARCS

  5. Think about this, again 202.131.29.70 = www.naver.com 74.125.67.100 = www.google.com 203.226.253.11 = www.nate.com 211.115.77.211 = www.daum.net 143.248.234.102 = sparcs.kaist.ac.kr  SPARCS

  6. But How? I don’t know! www.naver.com ? 202.131.29.70 ! Zzzzz…. Please download this! Oh, that`s 202.131.29.70 SPARCS

  7. What about this? I said, I DON`T KNOW! www.naver.com ? Oh, kill me  ZZZZZzzz…. Anyway download it! SPARCS

  8. Server is also Computer Die, Hang, Stop, Busy, Powered off Then, Why don`t we “Distribute” it? SPARCS

  9. Let`s Distribute! I think 202.131.29.70 www.naver.com ? What the f…..? That`s 110.76.24.34! I swear that naver domain is gone Simple! 234.222.1.4 SPARCS

  10. What do we need? We need Protocol (Agreement) SPARCS

  11. Domain Name Server www.naver.com ? Oh, that`s 202.131.29.70 DNS SPARCS

  12. Protocol #1 – How to request What`s the IP of www.naver.com ? ???????? ¿ Quées el IP de www.naver.com ? SPARCS

  13. Protocol #1 – How to request Port : UDP 53 Format : www.naver.com ? Oh, that`s 202.131.29.70 ;www.naver.com. IN A SPARCS

  14. Protocol #2 – How to distribute DNS02, Do you know? DNS02, Do you know? www.naver.com ? ……? DNS03, Do you know? DNS03, Do you know? DNS01, Do you Know? DNS01, Do you Know? SPARCS

  15. Protocol #2 – How to distribute sparcs . kaist . ac . kr SPARCS

  16. Protocol #2 – How to distribute Top level : kr, com, gov, mil Second Level : co, pe, ne Third Level(hostname) : kaist, google *Fourth level : Anything! Distribution by Hierarchy SPARCS

  17. Protocol #2 – How to distribute 4. Ask ac, 110.42.3.1 From : mail.seoul.go.kr Request : sparcs.kaist.ac.kr 3. kr? Do you know? 5. I think kaist knows that 2. go? Do you know? 6. sparcs = 143.248.246.102 1. seoul? Do you know? 7. 143.248.246.102! SPARCS

  18. Protocol #3 – Update a.com = 164.240.4.23 We need Update! Gosh! I`ll update a.com I Thought thata.com doesn`t exist! I already know that SPARCS

  19. Protocol #3 – Update SPARCS

  20. Protocol #3 – Update korea -> koryuh?! Oh.. korea -> koryuh SPARCS

  21. Protocol #3 – Update Periodically Update : Cache Time So It takes some time when you Update, Buy, Setup Your Domain. SPARCS

  22. Protocol #4 – How to Manage Authority Zone SPARCS

  23. Protocol #4 – How to Manage Take a Look at sparcs.org nan.sparcs.org mir.sparcs.org bit.sparcs.org ksearch.sparcs.org Authority Server Zone SPARCS

  24. We`ve got a clue! We now know protocols! But… How can we set it up?Program helps us to follow “Protocol”?How can we make own PC as DNS? SPARCS

  25. Next seminar bind9 You will learn many more things! Making Authority Server, Setting Zone, SOA, TTL… SPARCS

  26. Appendix – Interesting Story What if “kr” DNS server goes DOWN? From: mail.seoul.go.kr Request: www.kaist.ac.kr SPARCS

  27. 2003.01.25 혜화전화국 DNS BiggestDNS (Uppermost) in Korea SPARCS

  28. Why? DDOS “Distribute Denial Of Service” attack SPARCS

  29. Familiar? It`s Happening AGAIN SPARCS

  30. To SPARCS pre-wheel Be informed! Search about recent Security Issue! Have some interest about it! Information is Power! SPARCS

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