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さまざまなゾーンを抱える権威サーバーだ。[[/zone]]

DNS queryの返答が信用できない。
  sharp.co.jp ゾーンは尊重するしかない。[[watchA/sharp.co.jp/ns1.sharp.co.jp]]

だが、sharp (TLD)ゾーンは信用できない。(脆弱である。)

責任をもつはずの
jp.sharp ゾーンを持っていない。

== TLD からの委譲 ==
=== jpから ===
{{{
$ dig -t soa sharp.co.jp @a.dns.jp

; <<>> DiG 9.16.1-Ubuntu <<>> -t soa sharp.co.jp @a.dns.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38241
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 3
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; NSID: 61 32 31 2e 74 79 6f ("a21.tyo")
; COOKIE: 204c27fcd20cb6da35d7e09f621179a5bc877ce70f63f8e2 (good)
;; QUESTION SECTION:
;sharp.co.jp.			IN	SOA

;; AUTHORITY SECTION:
sharp.co.jp.		86400	IN	NS	tg1.sharp.co.jp.
sharp.co.jp.		86400	IN	NS	ns1.sharp.co.jp.

;; ADDITIONAL SECTION:
tg1.sharp.co.jp.	86400	IN	A	61.214.248.155
ns1.sharp.co.jp.	86400	IN	A	61.214.248.154

;; Query time: 4 msec
;; SERVER: 203.119.1.1#53(203.119.1.1)
;; WHEN: 日  2月 20 08:13:41 JST 2022
;; MSG SIZE  rcvd: 147

}}}

=== sharpから ===
{{{
sharp.			86400	IN	SOA	a.gmoregistry.net. noc.gmoregistry.net. 1645309084 1800 900 604800 3600

sharp.			86400	IN	NS	a.gmoregistry.net.
sharp.			86400	IN	NS	b.gmoregistry.net.
sharp.			86400	IN	NS	k.gmoregistry.net.
sharp.			86400	IN	NS	l.gmoregistry.net.
}}}

{{{
$ dig -t ns jp.sharp @l.gmoregistry.net.

; <<>> DiG 9.16.1-Ubuntu <<>> -t ns jp.sharp @l.gmoregistry.net.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33925
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; NSID: 64 6e 73 31 2e 6a 70 74 79 6f 31 ("dns1.jptyo1")
;; QUESTION SECTION:
;jp.sharp.			IN	NS

;; AUTHORITY SECTION:
jp.sharp.		86400	IN	NS	ns1.sharp.co.jp.
jp.sharp.		86400	IN	NS	tg1.sharp.co.jp.

;; Query time: 4 msec
;; SERVER: 37.209.198.4#53(37.209.198.4)
;; WHEN: 日  2月 20 08:16:15 JST 2022
;; MSG SIZE  rcvd: 99
}}}

=== jp.zone がない ===

{{{
$ dig -t ns jp.sharp @ns1.sharp.co.jp

; <<>> DiG 9.16.1-Ubuntu <<>> -t ns jp.sharp @ns1.sharp.co.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21935
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 4b41a6e1bac498106232eb1962117abc4f032995db7a00b6 (good)
;; QUESTION SECTION:
;jp.sharp.			IN	NS

;; ANSWER SECTION:
jp.sharp.		300	IN	CNAME	ualsharp.hs.llnwd.net.

;; Query time: 16 msec
;; SERVER: 61.214.248.154#53(61.214.248.154)
;; WHEN: 日  2月 20 08:18:20 JST 2022
;; MSG SIZE  rcvd: 100

}}}

== 問い合わせが間違っているが ==
こんな返事もある。sharp TLDゾーンを管理しているつもりか。

{{{
$ dig -t soa sharp @ns1.sharp.co.jp

; <<>> DiG 9.16.1-Ubuntu <<>> -t soa sharp @ns1.sharp.co.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29985
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 03b4474c79073feaa8a70e0062117af51f91e23c7bd5df57 (good)
;; QUESTION SECTION:
;sharp.				IN	SOA

;; ANSWER SECTION:
sharp.			600	IN	SOA	ns1.sharp.co.jp. postmaster.sharp.co.jp. 2022020401 3600 1800 1209600 3600

;; AUTHORITY SECTION:
sharp.			600	IN	NS	tg1.sharp.co.jp.
sharp.			600	IN	NS	ns1.sharp.co.jp.

;; ADDITIONAL SECTION:
ns1.sharp.co.jp.	43200	IN	A	61.214.248.154
tg1.sharp.co.jp.	60	IN	A	61.214.248.155

;; Query time: 15 msec
;; SERVER: 61.214.248.154#53(61.214.248.154)
;; WHEN: 日  2月 20 08:19:17 JST 2022
;; MSG SIZE  rcvd: 188


}}}
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