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= リゾルバーからの返答 =
すくなくとも5種類の返答がある。
  周辺のqueryも調査しておくとよさそう。-- ToshinoriMaeno <<DateTime(2022-10-25T19:10:28+0900)>>

これも参考になる。
https://dnschecker.org/#NS/nike.co.jp

== dnscache ==
FreeBSD, Ubuntu  (TTL から見て、親･JPからの返答[[../]]を返しているようだ。)
{{{
%dig -t ns nike.co.jp @127.0.0.1                                         ~

; <<>> DiG 9.12.1 <<>> -t ns nike.co.jp @127.0.0.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24152
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;nike.co.jp.			IN	NS

;; ANSWER SECTION:
nike.co.jp.		39894	IN	NS	dns02.bekknet.ad.jp.
nike.co.jp.		39894	IN	NS	dns01.bekknet.ad.jp.

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Oct 25 09:27:37 JST 2022
;; MSG SIZE  rcvd: 79

}}}

== unbound ==
手元で動かしているもの。 NS, CNAMEをともに返してくるのはおかしい。
{{{
$ dig -t ns nike.co.jp @127.0.0.2

; <<>> DiG 9.18.1-1ubuntu1.2-Ubuntu <<>> -t ns nike.co.jp @127.0.0.2
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28978
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;nike.co.jp.			IN	NS

;; ANSWER SECTION:
nike.co.jp.		600	IN	NS	dns02.bekknet.ad.jp.
nike.co.jp.		600	IN	NS	dns01.bekknet.ad.jp.
nike.co.jp.		600	IN	CNAME	cojp.nike.jp.

;; Query time: 251 msec
;; SERVER: 127.0.0.2#53(127.0.0.2) (UDP)
;; WHEN: Tue Oct 25 09:24:25 JST 2022
;; MSG SIZE  rcvd: 114

}}}

類似

%dig -t ns nike.co.jp @218.216.176.116  

== 1.1.1.1/8.8.8.8 ==
RCode NXDOMAIN

NSを問い合わせているのに、 CNAMEを返すのも変だ。-- ToshinoriMaeno <<DateTime(2022-10-25T09:23:59+0900)>>
{{{
$ dig -t ns nike.co.jp @1.1.1.1

; <<>> DiG 9.18.1-1ubuntu1.2-Ubuntu <<>> -t ns nike.co.jp @1.1.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 63455
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; NSID: 34 34 38 6d 31 32 38 ("448m128")
;; QUESTION SECTION:
;nike.co.jp.			IN	NS

;; ANSWER SECTION:
nike.co.jp.		600	IN	CNAME	cojp.nike.jp.

;; AUTHORITY SECTION:
nike.jp.		900	IN	SOA	ns-1870.awsdns-41.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

;; Query time: 20 msec
;; SERVER: 1.1.1.1#53(1.1.1.1) (UDP)
;; WHEN: Tue Oct 25 09:20:51 JST 2022
;; MSG SIZE  rcvd: 161
}}}
== OpenDNS ==
{{{
$ dig -t ns nike.co.jp @208.67.222.220

; <<>> DiG 9.18.1-1ubuntu1.2-Ubuntu <<>> -t ns nike.co.jp @208.67.222.220
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 3055
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; NSID: 6d 35 33 2e 6e 72 74 ("m53.nrt")
;; QUESTION SECTION:
;nike.co.jp.			IN	NS

;; ANSWER SECTION:
nike.co.jp.		600	IN	CNAME	cojp.nike.jp.

;; AUTHORITY SECTION:
nike.jp.		900	IN	SOA	ns-1870.awsdns-41.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

;; Query time: 15 msec
;; SERVER: 208.67.222.220#53(208.67.222.220) (UDP)
;; WHEN: Tue Oct 25 09:54:43 JST 2022
;; MSG SIZE  rcvd: 161
}}}
== 9.9.9.9 ==
NS, CNAMEの両方を返すのはもっと変か。(Unbound ?)
{{{
$ dig -t ns nike.co.jp @9.9.9.9

; <<>> DiG 9.18.1-1ubuntu1.2-Ubuntu <<>> -t ns nike.co.jp @9.9.9.9
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27575
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; NSID: 72 65 73 37 32 30 2e 71 68 6e 64 31 2e 72 72 64 6e 73 2e 70 63 68 2e 6e 65 74 ("res720.qhnd1.rrdns.pch.net")
;; QUESTION SECTION:
;nike.co.jp.			IN	NS

;; ANSWER SECTION:
nike.co.jp.		600	IN	NS	dns01.bekknet.ad.jp.
nike.co.jp.		600	IN	NS	dns02.bekknet.ad.jp.
nike.co.jp.		600	IN	CNAME	cojp.nike.jp.

;; Query time: 8 msec
;; SERVER: 9.9.9.9#53(9.9.9.9) (UDP)
;; WHEN: Tue Oct 25 09:23:07 JST 2022
;; MSG SIZE  rcvd: 144
}}}

== ? ==
おかしな返答
{{{
;; ANSWER SECTION:
nike.co.jp.		600	IN	NS	dns01.bekknet.ad.jp.
nike.co.jp.		600	IN	NS	dns02.bekknet.ad.jp.
}}}
----
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