TLD/net/gtld-servers.net/dig-logについて、ここに記述してください。 %dig -t ns net @192.55.83.30 ~ {{{ ; <<>> DiG 9.9.0 <<>> -t ns net @192.55.83.30 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60409 ;; flags: qr aa rd; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 16 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;net. IN NS ;; ANSWER SECTION: net. 172800 IN NS d.gtld-servers.net. net. 172800 IN NS b.gtld-servers.net. net. 172800 IN NS g.gtld-servers.net. net. 172800 IN NS f.gtld-servers.net. net. 172800 IN NS c.gtld-servers.net. net. 172800 IN NS a.gtld-servers.net. net. 172800 IN NS m.gtld-servers.net. net. 172800 IN NS l.gtld-servers.net. net. 172800 IN NS e.gtld-servers.net. net. 172800 IN NS h.gtld-servers.net. net. 172800 IN NS i.gtld-servers.net. net. 172800 IN NS k.gtld-servers.net. net. 172800 IN NS j.gtld-servers.net. ;; ADDITIONAL SECTION: d.gtld-servers.net. 172800 IN A 192.31.80.30 b.gtld-servers.net. 172800 IN A 192.33.14.30 b.gtld-servers.net. 172800 IN AAAA 2001:503:231d::2:30 g.gtld-servers.net. 172800 IN A 192.42.93.30 f.gtld-servers.net. 172800 IN A 192.35.51.30 c.gtld-servers.net. 172800 IN A 192.26.92.30 a.gtld-servers.net. 172800 IN A 192.5.6.30 a.gtld-servers.net. 172800 IN AAAA 2001:503:a83e::2:30 m.gtld-servers.net. 172800 IN A 192.55.83.30 l.gtld-servers.net. 172800 IN A 192.41.162.30 e.gtld-servers.net. 172800 IN A 192.12.94.30 h.gtld-servers.net. 172800 IN A 192.54.112.30 i.gtld-servers.net. 172800 IN A 192.43.172.30 k.gtld-servers.net. 172800 IN A 192.52.178.30 j.gtld-servers.net. 172800 IN A 192.48.79.30 ;; Query time: 77 msec ;; SERVER: 192.55.83.30#53(192.55.83.30) ;; WHEN: Fri Apr 8 10:36:55 2016 ;; MSG SIZE rcvd: 517 }}} == aa flagはadditional sectionにも権威」があるということではない == こっちは「権威」なしの委譲返答だ。??? %dig -t ns gtld-servers.net @192.55.83.30 ~ {{{ ; <<>> DiG 9.9.0 <<>> -t ns gtld-servers.net @192.55.83.30 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19863 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 9 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;gtld-servers.net. IN NS ;; AUTHORITY SECTION: gtld-servers.net. 172800 IN NS av1.nstld.com. gtld-servers.net. 172800 IN NS av2.nstld.com. gtld-servers.net. 172800 IN NS av3.nstld.com. gtld-servers.net. 172800 IN NS av4.nstld.com. ;; ADDITIONAL SECTION: av1.nstld.com. 172800 IN A 192.42.177.30 av1.nstld.com. 172800 IN AAAA 2001:500:124::30 av2.nstld.com. 172800 IN A 192.42.178.30 av2.nstld.com. 172800 IN AAAA 2001:500:125::30 av3.nstld.com. 172800 IN A 192.82.133.30 av3.nstld.com. 172800 IN AAAA 2001:500:126::30 av4.nstld.com. 172800 IN A 192.82.134.30 av4.nstld.com. 172800 IN AAAA 2001:500:127::30 ;; Query time: 85 msec ;; SERVER: 192.55.83.30#53(192.55.83.30) ;; WHEN: Fri Apr 8 10:39:33 2016 ;; MSG SIZE rcvd: 302 }}} $ dnsq a a.gtld-servers.net a.gtld-servers.net {{{ 1 a.gtld-servers.net: 293 bytes, 1+0+4+8 records, response, noerror query: 1 a.gtld-servers.net authority: gtld-servers.net 172800 NS av1.nstld.com authority: gtld-servers.net 172800 NS av2.nstld.com authority: gtld-servers.net 172800 NS av3.nstld.com authority: gtld-servers.net 172800 NS av4.nstld.com additional: av1.nstld.com 172800 A 192.42.177.30 additional: av1.nstld.com 172800 28 \040\001\005\000\001$\000\000\000\000\000\000\000\000\0000 additional: av2.nstld.com 172800 A 192.42.178.30 additional: av2.nstld.com 172800 28 \040\001\005\000\001%\000\000\000\000\000\000\000\000\0000 additional: av3.nstld.com 172800 A 192.82.133.30 additional: av3.nstld.com 172800 28 \040\001\005\000\001&\000\000\000\000\000\000\000\000\0000 additional: av4.nstld.com 172800 A 192.82.134.30 additional: av4.nstld.com 172800 28 \040\001\005\000\001'\000\000\000\000\000\000\000\000\0000 }}}