1. DNS/リゾルバー/JPサーバ
root-serversにJP NSを問い合わせると以下のような返事がえられる。
- ここでa.dns.jpなどはjpゾーン内の名前ではないことに注意。(あとで分かることだ）
- additional sectionにあるIPアドレスを受け入れて、問い合わせを続けよう。
- ToshinoriMaeno 2016-10-17 00:59:56
$ dig -t ns jp @a.root-servers.net
; <<>> DiG 9.9.5-3ubuntu0.9-Ubuntu <<>> -t ns jp @a.root-servers.net ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50173 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 7, ADDITIONAL: 14 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1472 ;; QUESTION SECTION: ;jp. IN NS ;; AUTHORITY SECTION: jp. 172800 IN NS a.dns.jp. jp. 172800 IN NS b.dns.jp. jp. 172800 IN NS c.dns.jp. jp. 172800 IN NS d.dns.jp. jp. 172800 IN NS e.dns.jp. jp. 172800 IN NS f.dns.jp. jp. 172800 IN NS g.dns.jp. ;; ADDITIONAL SECTION: a.dns.jp. 172800 IN A 203.119.1.1 b.dns.jp. 172800 IN A 202.12.30.131 c.dns.jp. 172800 IN A 156.154.100.5 d.dns.jp. 172800 IN A 210.138.175.244 e.dns.jp. 172800 IN A 192.50.43.53 f.dns.jp. 172800 IN A 150.100.6.8 g.dns.jp. 172800 IN A 203.119.40.1 a.dns.jp. 172800 IN AAAA 2001:dc4::1 b.dns.jp. 172800 IN AAAA 2001:dc2::1 c.dns.jp. 172800 IN AAAA 2001:502:ad09::5 d.dns.jp. 172800 IN AAAA 2001:240::53 e.dns.jp. 172800 IN AAAA 2001:200:c000::35 f.dns.jp. 172800 IN AAAA 2001:2f8:0:100::153 ;; Query time: 63 msec ;; SERVER: 198.41.0.4#53(198.41.0.4) ;; WHEN: Mon Oct 17 09:57:20 JST 2016 ;; MSG SIZE rcvd: 427