ｽﾗｲﾄﾞ ﾀｲﾄﾙなし

Transcription

1 (DNS) (1) DNS (2) (3) 1

2 (*) 2

3 (repository) (registry) DNS FQDN IP DNS IP FQDN 3

4 Domain Name JPRS/JPNIC Host Name FQDN (Fully Qualified Domain Name) {host name} + {domain name} URL (Uniform Resource Locator) = {scheme} :// {FQDN}/{path}/{file name} FQDN scheme host name domain name URL 4

5 [ 1] whois [ 2] JPNIC 5

6 2 JPNIC 6

7 7

8 1 2 8

9 JP JPNIC JPRS JaPan Registry Service JPRS 9

10 10

11 IP # ASSIGN USER TEMPLATE V 1.1 # Network Information: [ ] a.[ip ] /25 b. [ ] ABC-DUP-NET f. [ ] g. [Organization] Science Council Net Conference h. [ ] i.[ ] 1-2 j. [Address] 1-2, Kandaogawa-chou, Chiyoda-ku, Tokyo , Japan m. [ ] 1 n. [ ] JG000JP p. [ ] p. [ ] y. [ ] jiro@nic.ad.jp B. [network-plan] YES 25/40/70 D. [old-network] D. [old-network] E. [ ] F. [ ] XYZ-NET 11

12 12

13 DNS TLD(Top Level Domain) root; TLD; arpa com gov net org ae jp zw edu In-addr ibm pcd sun sun.pcd.ibm.com generic domains ad wide sh sh.wide.ad.jp country domains 13

14 gtld(generic Top Level Domain) firm for businesses, or firms shop for businesses offering goods to purchase web for entities emphasizing activities related to the WWW arts for entities emphasizing cultural and entertainment activities rec for entities emphasizing recreation/entertainment activities info for entities providing information services nom for those wishing individual or personal nomenclature 14

15 15

16 . M L K. A. root DNS resolver jp DNS named ad.jp DNS jp com org.. ad co ac.. wide.ad.jp DNS wide.ad.jp TLD DNS (generic, cc) 16

17 DNS - RFC1034/ DNS : named = BIND (Berkley Internet Name Domain) DNS : resolver - gethostbyname : Logical Address IP Address - gethostbyaddr IP Address Logical Name 17

18 DNS; Domain Name System zone ; DNS - primary name server - secondary name server zone transfer ; Primary_server Secondary_server recursive zone if (zone name server ) { NS-RR ; if (NS-RR ) { name server ; } } 18

19 RR (resource record) information IN SOA SRI-NIC.ARPA. HOSTMASTER.SRI-NIC.ARPA. ( ; serial 1800 ; refresh every 30 min 300 ; retry every 5 min ; expire after a week ) ; minimum of a day NS A.ISI.EDU. NS C.ISI.EDU. NS SRI-NIC.ARPA. EDU NS SRI-NIC.ARPA NS C.ISI.EDU SRI-NIC.ARPA. A A MX 0 SRI-NIC.ARPA. HINFO DEC-2060 TOPS20 USC-ISIC.ARPA CNAME C.ISI.EDU IN-ADDR.ARPA. PTR SRI-NIC.ARPA IN-ADDR.ARPA. PTR SRI-NIC.ARPA. SRI-NIC6.ARPA AAAA 1234:ffff:3456: :3456:ffff:1234.IN-ADDR.ARPA PTR SRI-NIC6.ARPA 19

20 RR(Resource Record) A (IPv4 Address) IPv4 AAAA (quad-a IPv6 Address) IPv6 NS (Name Server) MX (Mail exchange) DNS CNAME (Canonical Name) : SOA(Start of Authority) PTR (Domain name Pointer) HINFO (Host Information) 20

21 Configuration files for DNS system resolver configuration file ; /etc/resolve.conf sun % cat /etc/resolve.conf nameserver domain sh.wide.ad.jp sun % host gemini gemini.tuc.noao.edu A gemini.tuc.noao.edu A sun % host Name: svr4.tuc.noao.edu Address:

22 22

23 DNS - client verification - root NS root NS = PTR = NS = A = NS Rlogin server TCP connection Rlogin client = PTR = A? = PTR? = A = A? = A Server s NS Client s NS 23

24 DNS DNS (DNS-SEC) DNS Alternate Root TLD by ICANN (I-DNS) IPv DNS DHCP 24

25 (DNS) (1) DNS (2) (3) 25

26 TCP/IP DNS N DNS DNS IX IX :: from; from; hiroshi@wide.ad.jp hiroshi@wide.ad.jp to; to; bill@whitehouse.gov :: bill@whitehouse.gov from; from; hiroshi@wide.ad.jp hiroshi@wide.ad.jp to; to; bill@whitehouse.gov bill@whitehouse.gov DNS H B hiroshi@wide.ad.jp bill@whitehouse.gov 1. (POP) (SMTP) 1. Send Send mail mail to to Check Check received received mail mail Receive Receive mail mail from Mail-server Mail-server of of whitehouse.gov whitehouse.gov?? (DNS (DNS query) from hiroshi@wide.ad.jp hiroshi@wide.ad.jp query) It It is is (DNS (DNS reply) 5. reply) 5. Receive Receive mail mail to to bill@whitehouse.gov bill@whitehouse.gov Forward Forward mail mail to to Forward Forward mail(s) mail(s) to to host host B

27 User Mail Send Output Mail Spool MTA Output Mail TCP Connection SMTP User Mail Read MUA Input Mail Spool MTA Input Mail TCP Connection SMTP MUA; Mail User Agent MTA; Mail Transport Agent 27

28 User Mail Send SMTP Output Mail Spool MTA Output Mail TCP Connection SMTP User Mail Read MUA POP3 IMAP MDA Input Mail Spool MTA Input Mail TCP Connection SMTP MUA; Mail User Agent MTA; Mail Transport Agent MDA; Mail Delivery Agent 28

29 (1) MUA; Mail User Agent (2) MTA; Mail Transport Agent (3) MDA; Mail Delivery Agent (1) SMTP ; Simple Mail Transport Protocol (2) POP3 ; Post Office Protocol (3) IMAP4 ; Internet Message Access Protocol 29

30 SMTP; Simple Mail Transport Protocol SMTP SMTP Hello Hello DATA DATA DATA DATA 30

31 SMTP; Simple Mail Transport Protocol Connecting tomercury.webserve.ne.jp.via smtp >>> EHLO venus2.webserve.ne.jp 250-mercury.webserve.ne.jp Hello venus2.webserve.ne.jp [ ], please to meet you >>> MAIL SIZE= Sender ok >>> RCPT 250 Recipient ok >>> DATA 354 Enter mail, end with. on a line by itself >>>. 250 RAA00220 Message accepted for delivery >>> QUIT 221 mercury.webserve.ne.jp closing connection 31

32 POP3 1. ( ) (i) (ii) 2. TCP (port=110) 3. (plain password) telnet_port= 110 OK DPDATE Transaction QUIT 32

33 POP Intranet Internet POP (SMTP ) POP (SMTP ) 33

34 POP3; Post Office Protocol POP3 POP POP3 POP DATA DATA POP 34

35 POP3; Post Office Protocol % telnet almond.nuts.com 110 Trying Connected to almond.nuts.com. Escape character is ^]. +OK almond POP3 Server Process 3.3(1) at Mon 15-May-95 user hunt +OK User name (hunt) ok. Password, please pass Watts?Watt? +OK 2 messages in folder NEWMAIL (V3.3 rev B04) stat +OK retr 1 +OK 146 octets (mail data) del 1 +OK message # 1 deleted quit +OK POP3 almond Server exiting (0 NEWMAIL messages left) connection closed by foreign host. 35

36 APOP POP3 telnet(1 / ) (OTP) MD5(PROCESS_ID TIME_STAMP HOSTNAME APOP_PASSWORD) 36

37 APOP ; qpopper2.2 APOP (1) # mkdir /usr/local/bin/etc/popper # chown pop.bin /usr/local/bin/etc/popper # chmod 700 /usr/local/etc/popper (2) APOP DB # /usr/local/bin/popauth -init /usr/local/etc/popper/pop.auth.db 37

38 IMAP ; RFC2060 Internet Message Access Protocol ( ) (*) TCP (port=143) 38

39 IMAP Operation Mode Off-Line Model (POP3 ) On-Line Model (NFS ) Disconnect Use Model Off-Line On-Line 39

40 IMAP4 Access Terminal Internet IMAP4 Disconnect Use Model Mobile-PC Home-PC Down-Load & Up-Load Down-Load &Delete 40

41 Sendmail /etc/aliases list :user postmaster:root list : prog_log:/tmp/log list : listner: /etc/local/list_user list ::include:list_file project: :include: /etc/aliase/proj_file ; $home/.forward sendmail.cf ; CF ftp://ftp.kyoto.wide.ad.jp/pub/mail/cf/cf-3.6w.tar.gz 41

42 MIME ( ) MIME; Multipurpose Internet Mail Extensions (RFC2045, RFC2049) ASCII (1) (2) Header -MIME-Version Content-Type Content-Transfer-Encoding Counter-ID Content-Description Format MIME-Version:Major#.Minor# Content-Type/Type/Subtype[;parameter]... Content-Transfer-Encoding: Encoding Content-ID:msg-id Content-Description: 42

43 MIME Mail Example From Sun May 10 13:00: Received: from mars.webserve.ne.jp (mars.webserve.ne.jp [ ]) by mercury.webserve.ne.jp (2.5 Build 2640 Berkeley 8.8.6) /8.8.4) with SMTP id NAA0055 for <wenserve.ne.jp>; Sun, 10 May :00: Received: by mars.webserve.ne.jp Lotus SMTP MTA v ( )) id F05B ; Sun, 10 May :59: X-Lotus-FromDomain: WEBSERVE From: tsuzuki@webserve.ne.jp To: webtest@webserve.ne.jp Message-ID: < C880.00@mars.webserve.ne.jp> Date: Sun, 10 May :59: Subject: Mime-Version: 1.0 Content-Type: text/plain; charset=iso-2022-jp Content-Discription: inline 43

44 MIME Mail Example Subject: Subject: =?ISO-2022-JP?B?GyRCJUY1OSVIJE41YSE8JWsbKEI=?= =? ; begin =? ; end ISO-2202-JP ; B ; Encode (Bencoding) 44

45 MIME Encoding-Type Type 7 bit 7 8 bit 8 binary - BASE64 BASE64 BASE64 6 bits 10 (2 ) ; 3 Bytes (6 ) (10 ) ; 0 63 ( ) U x x / ; 4 Bytes 45

46 ; RFC1468 ISO-2022-JP (JIS ) RFC1468 / (*) JUNET 7 bits JIS Content Type:text/plain;charset=ISO-2022-JP EUC Extended UNIX Code (UNIX ) Shift-JIS JIS X

47 (DNS) (1) DNS (2) (3) 47

48 BBS (Bulletin Board System) News IRC(Internet Relay Chat) (Real WMT) Peer-to-Peer talk DVTS Hybrid VoIP (Voice over IP) Instant Messenger (AOL MS) 48

49 49

50 Instant Messenger 50

51 - RTP / UDP / IP / anylink - RTP for DV ; IETF standard track RFC - sfc.wide.ad..wide.ad.jp/dvts/ 51

52 52