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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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slide1

DNS

hodduc@sparcs

slide2

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

what is dns
What is dns?

2010 Pre-wheel group seminar : hodduc@sparcs

what is dns1
What is DNS?

DNS

Domain Name Service

Domain Name System

2010 Pre-wheel group seminar : hodduc@sparcs

what is dns2
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

domain name space
Domain Name Space

2010 Pre-wheel group seminar : hodduc@sparcs

domain name space1
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

dns zone
DNS Zone

2010 Pre-wheel group seminar : hodduc@sparcs

dns zone1
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

naming convention
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

naming convention1
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

resource records
Resource Records

2010 Pre-wheel group seminar : hodduc@sparcs

resource records1
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

resource types
Resource Types

물.론 훨씬 더 많지만..

주로 사용하는 것은 정해져 있음. (나머지는 구글링!)

2010 Pre-wheel group seminar : hodduc@sparcs

resource types1
Resource Types

2010 Pre-wheel group seminar : hodduc@sparcs

protocol
Protocol

2010 Pre-wheel group seminar : hodduc@sparcs

protocol1
혹시나 해서…Protocol : 표준화된 통신규약

2010 Pre-wheel group seminar : hodduc@sparcs

slide18

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

dns lookups
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

slide20
감이 잘 안 오시죠?직접 보여드립니다

2010 Pre-wheel group seminar : hodduc@sparcs

dns architecture
Dns Architecture

2010 Pre-wheel group seminar : hodduc@sparcs

domain querying
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

domain update
Domain Update

updated

2010 Pre-wheel group seminar : hodduc@sparcs

useful tools about dns
Useful Tools about dns

2010 Pre-wheel group seminar : hodduc@sparcs

hosts
Hosts

2010 Pre-wheel group seminar : hodduc@sparcs

hosts1
Hosts

2010 Pre-wheel group seminar : hodduc@sparcs

hosts2
Hosts

2010 Pre-wheel group seminar : hodduc@sparcs

dnsever
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

nslookup
Nslookup

DNS Server lookup software

Linux에도 있으나 이것만큼은 윈도우가..

Demo

2010 Pre-wheel group seminar : hodduc@sparcs

slide32
Bind

이건 다음 세미나를 기대하시길.. ‘3’

Berkeley Internet Name Daemon

네임 서버 구축 프로그램

2010 Pre-wheel group seminar : hodduc@sparcs

question
question

2010 Pre-wheel group seminar : hodduc@sparcs

references
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

thank you
hodduc@sparcsThank you!

2010 Pre-wheel group seminar : hodduc@sparcs