Pablo Fernandes wrote:
>Como faço para descobrir utilizando o nslookup, dig ou seja qual for a
>ferramenta, o valor do TTL setado para um domínio?
dig dominio
Só isso.
>Por exemplo, quero saber quanto tempo a consulta do domínio
>www.google.com.br fica armazenada aqui no meu DNS. Para isso só preciso
>saber o TTL configurado la no MAPA do servidor de autoridade sobre
>google.com.br.
$ dig www.google.com.br
; <<>> DiG 9.2.4 <<>> www.google.com.br
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48223
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 5, ADDITIONAL: 2
;; QUESTION SECTION:
;www.google.com.br. IN A
;; ANSWER SECTION:
www.google.com.br. 57078 IN CNAME www.google.com.
www.google.com. 900 IN CNAME www.l.google.com.
www.l.google.com. 280 IN A 64.233.179.104
www.l.google.com. 280 IN A 64.233.179.99
;; AUTHORITY SECTION:
l.google.com. 21065 IN NS e.l.google.com.
l.google.com. 21065 IN NS f.l.google.com.
l.google.com. 21065 IN NS a.l.google.com.
l.google.com. 21065 IN NS b.l.google.com.
l.google.com. 21065 IN NS c.l.google.com.
;; ADDITIONAL SECTION:
e.l.google.com. 83846 IN A 66.102.11.9
f.l.google.com. 65108 IN A 72.14.207.9
;; Query time: 2273 msec
;; SERVER: fec0:0:0:8000::11#53(fec0:0:0:8000::11)
;; WHEN: Thu Jun 30 21:09:24 2005
;; MSG SIZE rcvd: 227
Os TTL estão ali. Note que alguns dos valores vêm do meu cache.
Para impedir o cache:
$ dig www.google.com.br @ns1.google.com
; <<>> DiG 9.2.4 <<>> www.google.com.br @ns1.google.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39931
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 5
;; QUESTION SECTION:
;www.google.com.br. IN A
;; ANSWER SECTION:
www.google.com.br. 345600 IN CNAME www.google.com.
www.google.com. 900 IN CNAME www.l.google.com.
;; AUTHORITY SECTION:
l.google.com. 86400 IN NS a.l.google.com.
l.google.com. 86400 IN NS b.l.google.com.
l.google.com. 86400 IN NS c.l.google.com.
l.google.com. 86400 IN NS e.l.google.com.
l.google.com. 86400 IN NS f.l.google.com.
;; ADDITIONAL SECTION:
a.l.google.com. 86400 IN A 216.239.53.9
b.l.google.com. 86400 IN A 64.233.179.9
c.l.google.com. 86400 IN A 64.233.161.9
e.l.google.com. 86400 IN A 66.102.11.9
f.l.google.com. 86400 IN A 72.14.207.9
;; Query time: 227 msec
;; SERVER: 216.239.32.10#53(ns1.google.com)
;; WHEN: Thu Jun 30 21:10:31 2005
;; MSG SIZE rcvd: 243
--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
PGP/GPG: 0x6EF45358; fingerprint:
E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358
5. Swa he géanhwearf tó timbran, and hwonne he cóm, lá! Unix cwæð "Hello,
World". Ǽfre ǽghwilc wæs glæd and seo woruld wæs fréo.
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