DNS/毒盛/flip.e-ontap.com/上級編/AnswerNSについて、ここに記述してください。
Contents
BIND 9.12.3 では (@127.0.0.1) /unbound
- Authoritative Answer NSがキャッシュにあっても、上書きが起きることを体験する。
1. ゾーンからNS+A を取り込んでおく
$ dig -t ns flip.e-ontap.com @127.0.0.1 ; <<>> DiG 9.12.3 <<>> -t ns flip.e-ontap.com @127.0.0.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49517 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 2 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ; COOKIE: 0f5b13054b35fb194e0d53a95c3c4984c348ef68002f588d (good) ;; QUESTION SECTION: ;flip.e-ontap.com. IN NS ;; ANSWER SECTION: flip.e-ontap.com. 3371 IN NS ns.flip.e-ontap.com. ;; ADDITIONAL SECTION: ns.flip.e-ontap.com. 3371 IN A 150.42.6.1 ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: 月 1月 14 17:34:12 JST 2019 ;; MSG SIZE rcvd: 106
tmaeno@u16:~$ dig -t a ns.flip.e-ontap.com @127.0.0.1 ; <<>> DiG 9.12.3 <<>> -t a ns.flip.e-ontap.com @127.0.0.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6405 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ; COOKIE: 3790139c2c5153cf53c8592a5c3c498911ca8f52ad936233 (good) ;; QUESTION SECTION: ;ns.flip.e-ontap.com. IN A ;; ANSWER SECTION: ns.flip.e-ontap.com. 3366 IN A 150.42.6.1 ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: 月 1月 14 17:34:17 JST 2019 ;; MSG SIZE rcvd: 92
2. 毒
$ dig x1.flip.e-ontap.com @127.0.0.1 ; <<>> DiG 9.12.3 <<>> x1.flip.e-ontap.com @127.0.0.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64594 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ; COOKIE: 527224475d96ef81b3db45425c3c49c7a6f1da4930a02167 (good) ;; QUESTION SECTION: ;x1.flip.e-ontap.com. IN A ;; ANSWER SECTION: x1.flip.e-ontap.com. 60 IN A 150.42.6.1 ;; Query time: 11 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: 月 1月 14 17:35:19 JST 2019 ;; MSG SIZE rcvd: 92 tmaeno@u16:~$ dig x2.flip.e-ontap.com @127.0.0.1 ; <<>> DiG 9.12.3 <<>> x2.flip.e-ontap.com @127.0.0.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55609 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ; COOKIE: 8758e9369bf8f1d360d19a685c3c49d21b89890620d8cc5e (good) ;; QUESTION SECTION: ;x2.flip.e-ontap.com. IN A ;; ANSWER SECTION: x2.flip.e-ontap.com. 60 IN A 150.42.6.5 ;; Query time: 38 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: 月 1月 14 17:35:30 JST 2019 ;; MSG SIZE rcvd: 92 tmaeno@u16:~$ dig x3.flip.e-ontap.com @127.0.0.1 ; <<>> DiG 9.12.3 <<>> x3.flip.e-ontap.com @127.0.0.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52341 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ; COOKIE: 39ea3464843bff17c7bc7b735c3c49da3080b6a04b54a918 (good) ;; QUESTION SECTION: ;x3.flip.e-ontap.com. IN A ;; ANSWER SECTION: x3.flip.e-ontap.com. 60 IN A 150.42.6.5 ;; Query time: 11 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: 月 1月 14 17:35:38 JST 2019 ;; MSG SIZE rcvd: 92
3. 確認
tmaeno@u16:~$ dig +norec -t ns flip.e-ontap.com @127.0.0.1 ; <<>> DiG 9.12.3 <<>> +norec -t ns flip.e-ontap.com @127.0.0.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49118 ;; flags: qr ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 2 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ; COOKIE: d3b0b8bf17a0839d539eb45c5c3c49e9d00c2ff6063553da (good) ;; QUESTION SECTION: ;flip.e-ontap.com. IN NS ;; ANSWER SECTION: flip.e-ontap.com. 3270 IN NS ns.flip.internot.jp. ;; ADDITIONAL SECTION: ns.flip.internot.jp. 86377 IN A 150.42.6.5 ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: 月 1月 14 17:35:53 JST 2019 ;; MSG SIZE rcvd: 122