== watchNS/ayu-net.com/unbound ==

CNAMEがキャッシュにある状態で、unboundキャッシュにMXを問い合わせると、

$ dig -t mx ayu-net.com @127.0.0.2
{{{
; <<>> DiG 9.9.5-3ubuntu0.13-Ubuntu <<>> -t mx ayu-net.com @127.0.0.2
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11453
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1220
;; QUESTION SECTION:
;ayu-net.com.			IN	MX

;; ANSWER SECTION:
ayu-net.com.		280	IN	CNAME	blog-01.livedoor.jp.

;; AUTHORITY SECTION:
livedoor.jp.		2680	IN	SOA	ns1.naver.jp. domain.linecorp.com. 2017021400 10800 3600 604800 3600

;; Query time: 5 msec
;; SERVER: 127.0.0.2#53(127.0.0.2)
;; WHEN: Sun Feb 19 22:16:20 JST 2017
;; MSG SIZE  rcvd: 135
}}}

== キャッシュからCNAMEが消えたら ==

$ dig -t mx ayu-net.com @127.0.0.2
{{{
; <<>> DiG 9.9.5-3ubuntu0.13-Ubuntu <<>> -t mx ayu-net.com @127.0.0.2
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 932
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1220
;; QUESTION SECTION:
;ayu-net.com.			IN	MX

;; ANSWER SECTION:
ayu-net.com.		1200	IN	CNAME	blog-01.livedoor.jp.

;; AUTHORITY SECTION:
livedoor.jp.		2385	IN	SOA	ns1.naver.jp. domain.linecorp.com. 2017021400 10800 3600 604800 3600

;; Query time: 156 msec
;; SERVER: 127.0.0.2#53(127.0.0.2)
;; WHEN: Sun Feb 19 22:21:15 JST 2017
;; MSG SIZE  rcvd: 135
}}}

== CNAME があると ==
$ dig -t a ayu-net.com
{{{
; <<>> DiG 9.9.5-3ubuntu0.13-Ubuntu <<>> -t a ayu-net.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3417
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1220
;; QUESTION SECTION:
;ayu-net.com.			IN	A

;; ANSWER SECTION:
ayu-net.com.		1199	IN	CNAME	blog-01.livedoor.jp.
blog-01.livedoor.jp.	3600	IN	A	125.6.190.6

;; Query time: 173 msec
;; SERVER: 127.0.0.2#53(127.0.0.2)
;; WHEN: Sun Feb 19 23:20:39 JST 2017
;; MSG SIZE  rcvd: 89
}}}

NSを欲しいのにCNAMEが返ってくる。（乗取り成功かい）

$ dig -t ns ayu-net.com
{{{
; <<>> DiG 9.9.5-3ubuntu0.13-Ubuntu <<>> -t ns ayu-net.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52026
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1220
;; QUESTION SECTION:
;ayu-net.com.			IN	NS

;; ANSWER SECTION:
ayu-net.com.		1193	IN	CNAME	blog-01.livedoor.jp.

;; AUTHORITY SECTION:
livedoor.jp.		3593	IN	SOA	ns1.naver.jp. domain.linecorp.com. 2017021400 10800 3600 604800 3600

;; Query time: 0 msec
;; SERVER: 127.0.0.2#53(127.0.0.2)
;; WHEN: Sun Feb 19 23:20:45 JST 2017
;; MSG SIZE  rcvd: 135
}}}