DNS/委譲/rootserverについて、ここに記述してください。
1. .com 問い合わせの返答
ADDITIONAL SECTION が余計だということが分かるかな。
f%dig +norec google.com @a.root-servers.net ~ ; <<>> DiG 9.9.0 <<>> +norec google.com @a.root-servers.net ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4671 ;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 16 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;google.com. IN A ;; AUTHORITY SECTION: com. 172800 IN NS m.gtld-servers.net. com. 172800 IN NS l.gtld-servers.net. com. 172800 IN NS k.gtld-servers.net. com. 172800 IN NS j.gtld-servers.net. com. 172800 IN NS i.gtld-servers.net. com. 172800 IN NS h.gtld-servers.net. com. 172800 IN NS g.gtld-servers.net. com. 172800 IN NS f.gtld-servers.net. com. 172800 IN NS e.gtld-servers.net. com. 172800 IN NS d.gtld-servers.net. com. 172800 IN NS c.gtld-servers.net. com. 172800 IN NS b.gtld-servers.net. com. 172800 IN NS a.gtld-servers.net. ;; ADDITIONAL SECTION: m.gtld-servers.net. 172800 IN A 192.55.83.30 l.gtld-servers.net. 172800 IN A 192.41.162.30 k.gtld-servers.net. 172800 IN A 192.52.178.30 j.gtld-servers.net. 172800 IN A 192.48.79.30 i.gtld-servers.net. 172800 IN A 192.43.172.30 h.gtld-servers.net. 172800 IN A 192.54.112.30 g.gtld-servers.net. 172800 IN A 192.42.93.30 f.gtld-servers.net. 172800 IN A 192.35.51.30 e.gtld-servers.net. 172800 IN A 192.12.94.30 d.gtld-servers.net. 172800 IN A 192.31.80.30 c.gtld-servers.net. 172800 IN A 192.26.92.30 b.gtld-servers.net. 172800 IN A 192.33.14.30 b.gtld-servers.net. 172800 IN AAAA 2001:503:231d::2:30 a.gtld-servers.net. 172800 IN A 192.5.6.30 a.gtld-servers.net. 172800 IN AAAA 2001:503:a83e::2:30 ;; Query time: 111 msec ;; SERVER: 198.41.0.4#53(198.41.0.4) ;; WHEN: Tue Aug 13 13:08:09 2013 ;; MSG SIZE rcvd: 527
dnsops 事務局のひとの発言：
「外部名ではあるもののゾーン外ではないため、きちんとグルーが返っています。」
?? このひとも理解していない。 （誰もつっこまないの）
2. .org
%dig +norec japan.org @a.root-servers.net ~ ; <<>> DiG 9.9.0 <<>> +norec japan.org @a.root-servers.net ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28112 ;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 13 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;japan.org. IN A ;; AUTHORITY SECTION: org. 172800 IN NS d0.org.afilias-nst.org. org. 172800 IN NS b2.org.afilias-nst.org. org. 172800 IN NS b0.org.afilias-nst.org. org. 172800 IN NS c0.org.afilias-nst.info. org. 172800 IN NS a2.org.afilias-nst.info. org. 172800 IN NS a0.org.afilias-nst.info. ;; ADDITIONAL SECTION: d0.org.afilias-nst.org. 172800 IN A 199.19.57.1 d0.org.afilias-nst.org. 172800 IN AAAA 2001:500:f::1 b2.org.afilias-nst.org. 172800 IN A 199.249.120.1 b2.org.afilias-nst.org. 172800 IN AAAA 2001:500:48::1 b0.org.afilias-nst.org. 172800 IN A 199.19.54.1 b0.org.afilias-nst.org. 172800 IN AAAA 2001:500:c::1 c0.org.afilias-nst.info. 172800 IN A 199.19.53.1 c0.org.afilias-nst.info. 172800 IN AAAA 2001:500:b::1 a2.org.afilias-nst.info. 172800 IN A 199.249.112.1 a2.org.afilias-nst.info. 172800 IN AAAA 2001:500:40::1 a0.org.afilias-nst.info. 172800 IN A 199.19.56.1 a0.org.afilias-nst.info. 172800 IN AAAA 2001:500:e::1 ;; Query time: 118 msec ;; SERVER: 198.41.0.4#53(198.41.0.4) ;; WHEN: Tue Aug 13 22:20:59 2013 ;; MSG SIZE rcvd: 440
3. qmail.jp query
どう違うか、説明できますか。
%dig +norec qmail.jp @a.root-servers.net ~ ; <<>> DiG 9.9.0 <<>> +norec qmail.jp @a.root-servers.net ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5659 ;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 7, ADDITIONAL: 14 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1472 ;; QUESTION SECTION: ;qmail.jp. IN A ;; 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: 117 msec ;; SERVER: 198.41.0.4#53(198.41.0.4) ;; WHEN: Tue Aug 13 13:51:53 2013 ;; MSG SIZE rcvd: 433