## page was renamed from DNS/用語/PublicDNS/8.8.8.8
## page was renamed from DNS/PublicDNS/8.8.8.8
## page was renamed from DNS/キャッシュサーバ/8.8.8.8
== Google public DNS ==
[[/日本]]


$ dig +tcp any qmail.jp @8.8.8.8
{{{
; <<>> DiG 9.7.3 <<>> +tcp any qmail.jp @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21821
;; flags: qr rd ra; QUERY: 1, ANSWER: 12, AUTHORITY: 0, ADDITIONAL: 0

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

;; ANSWER SECTION:
qmail.jp.		86400	IN	SOA	a.ns.qmail.jp. hostmaster.m.qmail.jp. 1306498529 16384 2048 1048576 86400
qmail.jp.		86400	IN	NS	a.ns.qmail.jp.
qmail.jp.		86400	IN	NS	uz5b3p79vgf8v8yttum0fr1cbpg4tr0gdywhvwzdmb6u3hj6b8lk30.a.ns.qmail.jp.
qmail.jp.		86400	IN	TXT	"Powered by djbdns - http://cr.yp.to/djbdns.html"
qmail.jp.		86400	IN	MX	0 a.mx.qmail.jp.
qmail.jp.		86400	IN	MX	0 abcdefghijklmnopqrstuvwxyz.mx.qmail.jp.
qmail.jp.		86400	IN	MX	0 abcdefghijklmnopqrstuvwxyz0.mx.qmail.jp.
qmail.jp.		86400	IN	MX	0 abcdefghijklmnopqrstuvwxyz1.mx.qmail.jp.
qmail.jp.		86400	IN	MX	0 abcdefghijklmnopqrstuvwxyz2.mx.qmail.jp.
qmail.jp.		86400	IN	MX	0 abcdefghijklmnopqrstuvwxyz3.mx.qmail.jp.
qmail.jp.		86400	IN	MX	0 abcdefghijklmnopqrstuvwxyz4.mx.qmail.jp.
qmail.jp.		86400	IN	A	127.0.0.128

;; Query time: 1757 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Jun 11 11:24:30 2011
;; MSG SIZE  rcvd: 523
}}}

最初だから、時間がかかる。

$ dig any qmail.jp @8.8.8.8
{{{
;; Truncated, retrying in TCP mode.

; <<>> DiG 9.7.3 <<>> any qmail.jp @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41263
;; flags: qr rd ra; QUERY: 1, ANSWER: 12, AUTHORITY: 0, ADDITIONAL: 0

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

;; ANSWER SECTION:
（...）

;; Query time: 67 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Jun 11 11:26:14 2011
;; MSG SIZE  rcvd: 523
}}}

;; Query time: 68 msec


$ dig +tcp any qmail.jp @8.8.8.8
{{{
; <<>> DiG 9.7.3 <<>> +tcp any qmail.jp @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34523
;; flags: qr rd ra; QUERY: 1, ANSWER: 12, AUTHORITY: 0, ADDITIONAL: 0

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

;; ANSWER SECTION:
(省略）

;; Query time: 74 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Jun 11 11:28:21 2011
;; MSG SIZE  rcvd: 523
}}}

$ time DNSCACHEIP=8.8.8.8 dnsqr any qmail.jp
{{{
255 qmail.jp:
523 bytes, 1+12+0+0 records, response, noerror
query: 255 qmail.jp
answer: qmail.jp 86011 SOA a.ns.qmail.jp hostmaster.m.qmail.jp 1306498529 16384 2048 1048576 86400
answer: qmail.jp 86011 NS a.ns.qmail.jp
answer: qmail.jp 86011 NS uz5b3p79vgf8v8yttum0fr1cbpg4tr0gdywhvwzdmb6u3hj6b8lk30.a.ns.qmail.jp
answer: qmail.jp 86011 16 /Powered\040by\040djbdns\040-\040http://cr.yp.to/djbdns.html
answer: qmail.jp 86011 MX 0 a.mx.qmail.jp
answer: qmail.jp 86011 MX 0 abcdefghijklmnopqrstuvwxyz.mx.qmail.jp
answer: qmail.jp 86011 MX 0 abcdefghijklmnopqrstuvwxyz0.mx.qmail.jp
answer: qmail.jp 86011 MX 0 abcdefghijklmnopqrstuvwxyz1.mx.qmail.jp
answer: qmail.jp 86011 MX 0 abcdefghijklmnopqrstuvwxyz2.mx.qmail.jp
answer: qmail.jp 86011 MX 0 abcdefghijklmnopqrstuvwxyz3.mx.qmail.jp
answer: qmail.jp 86011 MX 0 abcdefghijklmnopqrstuvwxyz4.mx.qmail.jp
answer: qmail.jp 86011 A 127.0.0.128

real	0m0.203s
user	0m0.000s
sys	0m0.000s
}}}