## page was renamed from watchNS/mediatv.ne.jp
watchNS/mediatv.ne.jpについて、ここに記述してください。

==  JP 登録、返答 ==
%dnsq a ns.mediatv.ne.jp a.dns.jp
{{{
1 ns.mediatv.ne.jp:
108 bytes, 1+0+2+2 records, response, noerror
query: 1 ns.mediatv.ne.jp
authority: mediatv.ne.jp 86400 NS ns.at-link.ad.jp
authority: mediatv.ne.jp 86400 NS ns.mediatv.ne.jp
additional: ns.mediatv.ne.jp 86400 A 61.206.45.168
additional: ns.at-link.ad.jp 86400 A 210.239.46.2
}}}

%dnsq a ns.mediatv.ne.jp 61.206.45.168
{{{
1 ns.mediatv.ne.jp:
92 bytes, 1+1+2+0 records, response, authoritative, weird ra, noerror
query: 1 ns.mediatv.ne.jp
answer: ns.mediatv.ne.jp 86400 A 61.206.45.168
authority: mediatv.ne.jp 86400 NS ns.mediatv.ne.jp
authority: mediatv.ne.jp 86400 NS ns.at-link.ad.jp
}}}

%dig -t a www.qmail.jp @61.206.45.168
{{{
; <<>> DiG 9.9.0 <<>> -t a www.qmail.jp @61.206.45.168
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42300
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.qmail.jp.			IN	A

;; ANSWER SECTION:
www.qmail.jp.		86400	IN	A	14.192.44.5

;; AUTHORITY SECTION:
qmail.jp.		86400	IN	NS	a.ns.qmail.jp.

;; Query time: 31 msec
;; SERVER: 61.206.45.168#53(61.206.45.168)
;; WHEN: Sun May 10 21:49:06 2015
;; MSG SIZE  rcvd: 76
}}}

%dig -t a www.mediatv.ne.jp @61.206.45.168
{{{
; <<>> DiG 9.9.0 <<>> -t a www.mediatv.ne.jp @61.206.45.168
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15720
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.mediatv.ne.jp.		IN	A

;; ANSWER SECTION:
www.mediatv.ne.jp.	86400	IN	CNAME	ns.mediatv.ne.jp.
ns.mediatv.ne.jp.	86400	IN	A	61.206.45.168

;; AUTHORITY SECTION:
mediatv.ne.jp.		86400	IN	NS	ns.mediatv.ne.jp.
mediatv.ne.jp.		86400	IN	NS	ns.at-link.ad.jp.

;; Query time: 7 msec
;; SERVER: 61.206.45.168#53(61.206.45.168)
;; WHEN: Sun May 10 21:51:55 2015
;; MSG SIZE  rcvd: 121
}}}

外部NSのAを問い合せてみると、

%dig -t a ns.at-link.ad.jp @61.206.45.168
{{{
; <<>> DiG 9.9.0 <<>> -t a ns.at-link.ad.jp @61.206.45.168
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56564
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;ns.at-link.ad.jp.		IN	A

;; ANSWER SECTION:
ns.at-link.ad.jp.	3600	IN	A	210.239.46.2

;; AUTHORITY SECTION:
at-link.ad.jp.		3600	IN	NS	dns3.at-link.ad.jp.
at-link.ad.jp.		3600	IN	NS	ns.at-link.ad.jp.

;; Query time: 19 msec
;; SERVER: 61.206.45.168#53(61.206.45.168)
;; WHEN: Sun May 10 21:52:46 2015
;; MSG SIZE  rcvd: 94
}}}

%dig -t a www.mediatv.ne.jp @61.206.45.168
{{{
; <<>> DiG 9.9.0 <<>> -t a www.mediatv.ne.jp @61.206.45.168
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35912
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.mediatv.ne.jp.		IN	A

;; ANSWER SECTION:
www.mediatv.ne.jp.	86400	IN	CNAME	ns.mediatv.ne.jp.
ns.mediatv.ne.jp.	86400	IN	A	61.206.45.168

;; AUTHORITY SECTION:
mediatv.ne.jp.		86400	IN	NS	ns.mediatv.ne.jp.
mediatv.ne.jp.		86400	IN	NS	ns.at-link.ad.jp.

;; ADDITIONAL SECTION:
ns.at-link.ad.jp.	3590	IN	A	210.239.46.2

;; Query time: 7 msec
;; SERVER: 61.206.45.168#53(61.206.45.168)
;; WHEN: Sun May 10 21:52:56 2015
;; MSG SIZE  rcvd: 137
}}}

== 非再帰検索でも ==
%dnsq a www.mediatv.ne.jp 61.206.45.168
{{{
1 www.mediatv.ne.jp:
126 bytes, 1+2+2+1 records, response, authoritative, weird ra, noerror
query: 1 www.mediatv.ne.jp
answer: www.mediatv.ne.jp 86400 CNAME ns.mediatv.ne.jp
answer: ns.mediatv.ne.jp 86400 A 61.206.45.168
authority: mediatv.ne.jp 86400 NS ns.mediatv.ne.jp
authority: mediatv.ne.jp 86400 NS ns.at-link.ad.jp
additional: ns.at-link.ad.jp 3569 A 210.239.46.2
}}}
additional に注目。ゴミだが、受け入れるリゾルバーもあるだろう。危険。