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2 Internet DNS DNS UUCP (JUNET ) ( ) mailconf

3 ( )

4 DNS name [ttl[ ttl] ] IN type value... < > << > type (A, MX, CNAME,...) value

5 A (Address) RR (Resource Record) IP IP MX (Mail exchanger) ) RR CNAME (Canonical NAME) RR

6 IP (A RR) IN A IP mail.x.co.jp jp.. IN A user@mail.x.co.jp

7 DNS nslookup dig host dnsquery bind

8 nslookupa(1) % nslookup sh.wide.ad..wide.ad.jp. Server: localhost Address: Name: sh.wide.ad..wide.ad.jp Address:

9 IP mail.x.co.jp IN A IN A ( ) DNS (?)

10 nslookupa(2) % nslookup jp-gate.wide.ad..wide.ad.jp Server: localhost Address: Name: jp-gate.wide.ad..wide.ad.jp. Addresses: , , ,

11 Generic MX (Mail exchanger) ) RR IN MX x.co.jp jp.. IN MX 10 mail.x.co.jp jp. user@x.co.jp MX A

12 nslookupmx % nslookup -q=mx wide.ad.jp jp. Server: localhost Address: wide.ad.jp preference = 10, mail exchanger = sh.wide.ad..wide.ad.jp : sh.wide.ad..wide.ad.jp internet address = (additional information)

13 (MX) x.co.jp jp. IN MX 10 mail1.x.co.jp jp. IN MX 50 mail2.x.co.jp jp. IN MX 100 mail.provider.ad.jp jp. ( ) mail1

14 MX MX RR Primary MX / Primary Mail Server First MX / First Mail Server Secondary MX / Secondary Mail Server Lower MX (( )

15 Lower MX MX RR sendmail -bt $= $=w MX RR RR Lower MX

16 x.co.jp jp. IN MX 10 mail1.x.co.jp jp. IN MX 10 mail2.x.co.jp jp. A RR IP IP spool full MX

17 MX A Secondary MX IP IP A ( ) DNS ( )

18 MX (cont.) *.x.co. x.co.jp.. IN MX 10 mail.x.co.jp jp. Firewall ( ) : : root Wildcard MX nohost.x.co..x.co.jp host. host.nosubdom.x.co..x.co.jp

19 MX (cont d) specific ns.x.co..x.co.jp. IN A *.x.co.jp jp. ns.x.co..x.co.jp. IN MX 10 mail.x.co.jp jp. IN MX 10 mail.x.co.jp jp.. (( ) MX

20 CNAME (Canonical NAME) RR ( ) archie.wide.ad..wide.ad.jp (=sun3.tokyo tokyo.wide.ad..wide.ad.jp) pop.x.co.jp jp.. IN CNAME host1.x.co.jp jp. CNAME RR

21 CNAME RR (cont d) CNAME RR MX RR CNAME? A RR

22 nslookupcname % nslookup -q=cname archie.wide.ad..wide.ad.jp. Server: localhost Address: archie.wide.ad..wide.ad.jp canonical name = sun3.tokyo tokyo.wide.ad..wide.ad.jp

23 DNS (cont.) 1. CNAME CNAME ( ) 2. MX preference MX A Additional Information

24 DNS (cont d) 3. A MX MX (Additional Info. A ) A 2 (MX A) MX

25 MX RR CNAME CNAME CNAME

26 (A-Z, a-z) (0-9) (-) ( ( _ ) RFC1035(S), RFC1123(S) (4.9.4 )bindresolver _ (res_hnok)

27 MX RR CNAME MX RR CNAME Lower MX MX RR named

28 CNAME (RFC1123(S)) ( )sendmail sendmail.cf MX A IETF CNAME (?)

29 CNAME CNAME RR CNAME RR alias1 alias2 RFC1034(S) IN CNAME alias2 IN CNAME real-name (should not) (should) sendmail named 8 (MAXCNAMES) (MAXCNAMEDEPTH)

30 DNS - DNS -

31 (zone) my.domain.jp zone = *my.domain.jp

32 /etc/named.boot (bind 4.x) directory /etc/namedb primary my.domain.jp my.domain.zone /etc/named.conf conf (bind 8.x) options { directory "/etc/" /etc/namedb"; }; zone "my.domain.jp jp" " { file "my.domain.zone" my.domain.zone"; }; /etc/ /etc/namedb/my.domain.zone

33 (cont.) ; $ORIGIN $ my.domain.jp IN SOA... IN NS ; my.domain.jp jp. a IN A... IN MX... ; a.my.domain.jp jp.

34 (cont d) MX/CNAME RR. $ORIGIN named.{boot,conf

35 SOA () IN SOA... ( ; Serial )

36 SIGHUP # ps aux grep named 65??... named # kill -HUP 65 ndc (name daemon control interface) # ndc reload

37 (DNS DNS )

38 named 4.9 (BIND_NOTIFY) SOA

39 FORCED_RELOAD SIGHUP named named-xfer # mv mydomain.zone mydomain.zone..zone.bak # ndc restart

40 MX ( )

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