DNS/1/PublicDNS/Google/ttl

DNS/キャッシュサーバの動作/浸透問題/googleについて、ここに記述してください。

Google キャッシュサーバもTTLの書き直しはしていないようだ。-- ToshinoriMaeno 2011-08-11 14:20:39

authority section をどう扱っているか。

$ dig ns @8.8.8.8 qmail.jp

; <<>> DiG 9.7.3 <<>> ns @8.8.8.8 qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5463
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;qmail.jp.                      IN      NS

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

;; Query time: 166 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:10 2011
;; MSG SIZE  rcvd: 45

tmaeno@:~$ dig ns @8.8.8.8 qmail.jp

; <<>> DiG 9.7.3 <<>> ns @8.8.8.8 qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29211
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;qmail.jp.                      IN      NS

;; ANSWER SECTION:
qmail.jp.               86396   IN      NS      a.ns.qmail.jp.

;; Query time: 68 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:15 2011
;; MSG SIZE  rcvd: 45

tmaeno@:~$ dig ns @8.8.8.8 qmail.jp

; <<>> DiG 9.7.3 <<>> ns @8.8.8.8 qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41888
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;qmail.jp.                      IN      NS

;; ANSWER SECTION:
qmail.jp.               86392   IN      NS      a.ns.qmail.jp.

;; Query time: 70 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:19 2011
;; MSG SIZE  rcvd: 45

tmaeno@:~$ dig a @8.8.8.8 www.qmail.jp

; <<>> DiG 9.7.3 <<>> a @8.8.8.8 www.qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28756
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.qmail.jp.                  IN      A

;; ANSWER SECTION:
www.qmail.jp.           3600    IN      A       202.41.218.243

;; Query time: 164 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:31 2011
;; MSG SIZE  rcvd: 46

tmaeno@:~$ dig ns @8.8.8.8 qmail.jp

; <<>> DiG 9.7.3 <<>> ns @8.8.8.8 qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51507
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;qmail.jp.                      IN      NS

;; ANSWER SECTION:
qmail.jp.               86373   IN      NS      a.ns.qmail.jp.

;; Query time: 70 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:38 2011
;; MSG SIZE  rcvd: 45

MoinQ: DNS/1/PublicDNS/Google/ttl