1. watchA

2. 委譲の変更の影響を見る

事前の状態: isaac+liaに委譲されてactiveになっていた。

Sun Mar  1 11:50:00 JST 2020
isaac.ns.cloudflare.com.
lia.ns.cloudflare.com.

Sun Mar  1 12:50:00 JST 2020
rachel.ns.cloudflare.com.
sri.ns.cloudflare.com.

一時間後 (2020-03-01; )

;; ANSWER SECTION:
brau.jp.                3600    IN      SOA     rachel.ns.cloudflare.com. dns.cloudflare.com. 2033478277 10000 2400 604800 3600

このSOAのserialの意味は?

UNIX time への変換

https://keisan.casio.jp/exec/system/1526003938

2020-03-02 19:43:xx 1583145726

rachel+sri (cf@)をremoveしたら、即座に有効になったようだ。(deactivate)

3. whois

4. history

変更後:

$ dig -t ns brau.jp @a.dns.jp

; <<>> DiG 9.11.3-1ubuntu1.11-Ubuntu <<>> -t ns brau.jp @a.dns.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24483
;; 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
; COOKIE: d4aa6f9fca8eb11792c266ca5e5b1edff6c315e00dd2ca8a (good)
;; QUESTION SECTION:
;brau.jp.                       IN      NS

;; AUTHORITY SECTION:
brau.jp.                86400   IN      NS      rachel.ns.cloudflare.com.
brau.jp.                86400   IN      NS      sri.ns.cloudflare.com.

;; Query time: 16 msec
;; SERVER: 203.119.1.1#53(203.119.1.1)
;; WHEN: Sun Mar 01 11:33:03 JST 2020
;; MSG SIZE  rcvd: 120

delegation情報のキャッシュTTLは一日だ。

5. cloudflare側の返答

$ dig -t ns brau.jp @sri.ns.cloudflare.com.

; <<>> DiG 9.11.3-1ubuntu1.11-Ubuntu <<>> -t ns brau.jp @sri.ns.cloudflare.com.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24048
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;brau.jp.                       IN      NS

;; ANSWER SECTION:
brau.jp.                86400   IN      NS      isaac.ns.cloudflare.com.
brau.jp.                86400   IN      NS      lia.ns.cloudflare.com.

;; Query time: 21 msec
;; SERVER: 173.245.59.234#53(173.245.59.234)
;; WHEN: Sun Mar 01 11:34:51 JST 2020
;; MSG SIZE  rcvd: 91

6. 一時間後

$ dig -t ns brau.jp @sri.ns.cloudflare.com

; <<>> DiG 9.11.3-1ubuntu1.11-Ubuntu <<>> -t ns brau.jp @sri.ns.cloudflare.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5664
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;brau.jp.                       IN      NS

;; ANSWER SECTION:
brau.jp.                86400   IN      NS      rachel.ns.cloudflare.com.
brau.jp.                86400   IN      NS      sri.ns.cloudflare.com.

;; Query time: 8 msec
;; SERVER: 173.245.59.234#53(173.245.59.234)
;; WHEN: Sun Mar 01 13:05:11 JST 2020
;; MSG SIZE  rcvd: 92

$ dig -t ns brau.jp @lia.ns.cloudflare.com

; <<>> DiG 9.11.3-1ubuntu1.11-Ubuntu <<>> -t ns brau.jp @lia.ns.cloudflare.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58241
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;brau.jp.                       IN      NS

;; ANSWER SECTION:
brau.jp.                86400   IN      NS      rachel.ns.cloudflare.com.
brau.jp.                86400   IN      NS      sri.ns.cloudflare.com.

;; Query time: 7 msec
;; SERVER: 173.245.58.185#53(173.245.58.185)
;; WHEN: Sun Mar 01 13:10:34 JST 2020
;; MSG SIZE  rcvd: 92


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