DNS/glue/unbound 1.9.1/netについて、ここに記述してください。
$ unbound-control flush_zone net ok removed 95 rrsets, 82 messages and 0 key entries tmaeno@u16:~$ unbound-control flush_zone com ok removed 54 rrsets, 47 messages and 0 key entries tmaeno@u16:~$ unbound-control flush_zone . ok removed 361 rrsets, 284 messages and 0 key entries
tmaeno@u16:~$ dig -t ns net ; <<>> DiG 9.14.0 <<>> -t ns net ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13754 ;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ;; QUESTION SECTION: ;net. IN NS ;; ANSWER SECTION: net. 172800 IN NS f.gtld-servers.net. net. 172800 IN NS a.gtld-servers.net. net. 172800 IN NS l.gtld-servers.net. net. 172800 IN NS b.gtld-servers.net. net. 172800 IN NS k.gtld-servers.net. net. 172800 IN NS j.gtld-servers.net. net. 172800 IN NS i.gtld-servers.net. net. 172800 IN NS d.gtld-servers.net. net. 172800 IN NS e.gtld-servers.net. net. 172800 IN NS c.gtld-servers.net. net. 172800 IN NS g.gtld-servers.net. net. 172800 IN NS m.gtld-servers.net. net. 172800 IN NS h.gtld-servers.net. ;; Query time: 286 msec ;; SERVER: 127.0.0.3#53(127.0.0.3) ;; WHEN: 月 4月 01 22:38:07 JST 2019 ;; MSG SIZE rcvd: 253
tmaeno@u16:~$ dig +norec -t ns nstld.com ; <<>> DiG 9.14.0 <<>> +norec -t ns nstld.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51317 ;; flags: qr ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ;; QUESTION SECTION: ;nstld.com. IN NS ;; ANSWER SECTION: nstld.com. 86390 IN NS av4.nstld.com. nstld.com. 86390 IN NS av2.nstld.com. nstld.com. 86390 IN NS av3.nstld.com. nstld.com. 86390 IN NS av1.nstld.com. ;; Query time: 0 msec ;; SERVER: 127.0.0.3#53(127.0.0.3) ;; WHEN: 月 4月 01 22:38:17 JST 2019 ;; MSG SIZE rcvd: 110