MUA (Mail User Agent) MTA (Mail Transfer Agent) DNS (Domain Name System) DNS MUA MTA MTA MUA MB mailbox MB

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2 MUA (Mail User Agent) MTA (Mail Transfer Agent) DNS (Domain Name System) DNS MUA MTA MTA MUA MB mailbox MB

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8 SMTP MAIL 250 sender ok RCPT 250 recipient ok DATA 354 Enter mail, end with "." on a line by itself From: announce@nic nic.ad..ad.jp To: Subject: Internet Week 97 ( ) Internet Week 97 [ ]. 250 Message accepted for delivery

10 3 ( ) ( ) ( ) MTA DNS MTA MB DNS

25 MX % sendmail -bt ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) Enter <ruleset> <address> > /mx wide.ad.jp getmxrr(wide.ad.jp.) returns 1 value(s): sh.wide.ad.jp. 9

26 (cont.) % sendmail -v motonori@wide.ad.jp < /dev/null motonori@wide.ad.jp... Connecting to sh.wide.ad.jp. via esmtp sh.wide.ad.jp ESMTP Sendmail ready >>> HELO endo.wide.ad.jp 250 sh.wide.ad.jp Hello endo.wide.ad.jp, pleased to meet you >>> MAIL From:<motonori@endo.wide.ad.jp> 250 <motonori@endo.wide.ad.jp>... Sender ok >>> RCPT TO:<motonori@wide.ad.jp> 250 <motonori@wide.ad.jp>... Recipient ok DNS -d (cont d) >>> DATA 354 Enter mail, end with "." on a line by itself >>>. 250 RAA01234 Message accepted for delivery >>> QUIT 221 sh.wide.ad.jp closing connection 11

33 SMTP % telnet localhost scherzo.mydomain ESMTP Sendmail 8.8.8/8.8.8;... HELO localhost 250 scherzo.mydomain Hello motonori@localhost, pleased to meet you MAIL FROM:<motonori> 250 motonori... Sender ok RCPT TO:<motonori> 250 motonori... Recipient ok DATA 354 Enter mail, end with "." on a line by itself this is a test WAA00359 Message accepted for delivery QUIT 221 scherzo.mydomain closing connection %

41 1 NS split-brain DNS ( zone ) Internet NS Internet a b

42 2 NS Internet b NS NS Internet a NS

49 ( ) S= R= 4 5 (/try) (/parse) (mailer) (local )

50 (1) sendmail -bt % sendmail -C new.cf -bt > 3,0 motonori@wide.ad.jp rewrite: ruleset 3 input: wide. ad. Jp : rewrite: ruleset 0 returns: $# smtp $@ wide. ad. jp. $: motonori wide. ad. jp > R5 sendmail 0 address R8 sendmail 3,0 address ( /parse)

51 (2) % sendmail -C new.cf -bt > 3,0 motonori@wide.ad.jp rewrite: ruleset 3 input: wide. ad. Jp : rewrite: ruleset 0 returns: $# local $: motonori > (3) 5 5 sendmail R8 3,0 local mailer aliases > 5 motonori rewrite: ruleset 5 input: motonori rewrite: ruleset 5 returns: $# smtp $@ spool $: motonori spool >

52 (4) > /tryflags HS > /try smtp motonori Trying header sender address motonori for mailer smtp rewrite: ruleset 3 input: motonori : rewrite: ruleset 4 returns: wide. ad. jp Rcode = 0, addr = motonori@wide.ad.jp

53 % sendmail -C new.cf -oq/tmp -v From: To: This is a test. % -oq/tmp SMTP # sendmail -C new.cf -bs 220 mail.wide.ad.jp ESMTP Sendmail MAIL FROM:<motonori> 250 <motonori>... Sender ok RCPT TO:<motonori> 250 <motonori>... Recipient ok DATA 354 Enter mail, end with "." on a line by itself test. 250 TAA13313 Message accepted for delivery QUIT 221 mail.wide.ad.jp closing connection

61 Ident firewall (cont.) Ident ( ) (133/TCP) RFC1413(PS) ID (login name) Sender MTA SMTP Ident Receiver MTA

70 ( ) root ( ) ( ) jp uk com org ac ad co or kyoto-u wide nic janog ad.jp domain jp domain

73 co ad nic net x sub2 sub1 delegation ( ) v6.wide.ad.jp zone wide.ad.jp zone x.co.jp zone co.jp zone root zone jp wide nic.ad.jp zone jp zone net zone ad.jp zone v6 kyoto tokyo

75 ( ) ad Unauthorized ns3 ns1 ns2 Authorized Servers wide.ad.jp ( )

76 root zone (root server) 3 jp zone jp 2 4 (ns.nic.ad.jp) root cache 5 ad ad.jp zone (ns.nic.ad.jp) 1 6 wide.ad.jp zone wide (ns.wide.ad.jp) ( ) root server root server jp zone Unauthorized Secondary

77 sample of named.boot (bind 4) directory /etc/namedb ; ( ) cache. root.cache ; localhost primary localhost localhost.zone primary in-addr.arpa localhost.rev ; primary wide.ad.jp wide.zone primary in-addr.arpa wide.rev ; secondary v6.wide.ad.jp sec/v6.zone

79 sample of named.conf (bind 8) options { directory "/etc/namedb"; }; zone "." { type hint; file "root.cache"; }; zone "localhost" { type master; file "localhost.zone"; }; zone " in-addr.arpa" { type master; file "localhost.rev"; }; zone "wide.ad.jp" { type master; file "wide.zone"; }; zone " in-addr.arpa" { type master; file "wide.rev"; }; zone "v6.wide.ad.jp jp" " { type slave; file "sec/v6.zone"; masters { ; }; };

80 sample of root.cache ; formerly NS.INTERNIC.NET IN NS A.ROOT-SERVERS.NET. A.ROOT-SERVERS.NET A ; ; formerly NS1.ISI.EDU NS B.ROOT-SERVERS.NET. B.ROOT-SERVERS.NET A : : ; housed in Japan, operated by WIDE NS M.ROOT-SERVERS.NET. M.ROOT-SERVERS.NET A

81 sample of localhost.zone ; $ORIGIN IN SOA ns.wide.ad.jp. postmaster.wide.ad.jp. ( 1 ; Serial number ; Refresh every 2 days 3600 ; Retry every hour ; Expire every 20 days ); Minimum 2 days ; IN NS localhost. ; IN A sample of localhost.rev ; $ORIGIN IN SOA ns.wide.ad.jp. postmaster.wide.ad.jp. ( 1 ; Serial number ; Refresh every 2 days 3600 ; Retry every hour ; Expire every 20 days ); Minimum 2 days ; IN NS localhost. ; 0 IN PTR loopback-net. 1 IN PTR localhost.

82 sample of wide.zone (cont.) sample of wide.zone (cont IN SOA ns.wide.ad.jp. two.wide.ad.jp. ( ; Serial 3600 ; Refresh 900 ; Retry ; Expire 3600 ; Minimum ) IN A IN NS ns IN NS ns.tokyo IN MX 10 sh ns IN A ns.tokyo IN A sh IN A www IN CNAME endo endo IN A localhost IN CNAME localhost. v6 IN NS ns1.v6 IN NS ns2.v6 ns1.v6 IN A ns2.v6 IN A

83 SOA (Start Of Authority) IN SOA <Pri-NS > < > ( 1 ; Serial ; Refresh (2d) 3600 ; Retry ; Expire (20d) ; Minimum TTL (2d)

87 .in-addr.arpa.

Contents CIDR IPv6 Wildcard MX DNS

9. DNS Contents CIDR IPv6 Wildcard MX DNS DNS (Domain Name System) IP ( ) ( root ( ) ) jp uk com org ac ad co or kyoto-u wide nic janog ad.jp domain jp domain Delegation( ) TOP domain, 2nd(3rd)-level domain