Eu tenho lutado com esse problema por um longo tempo ...
Por alguma razão desconhecida para mim, alguns endereços parecem não resolver, quando tento
dig www.google.com.br @localhost
me retorna:
; <<>> DiG 9.8.1-P1 <<>> www.google.com.br @localhost ;; global
options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status:
NOERROR, id: 46072 ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY:
4, ADDITIONAL: 4
;; QUESTION SECTION: ;www.google.com.br. IN A
;; ANSWER SECTION: www.google.com.br. 25 IN A
173.194.118.79 www.google.com.br. 25 IN A 173.194.118.87 www.google.com.br. 25 IN A 173.194.118.88 www.google.com.br. 25 IN A 173.194.118.95
;; AUTHORITY SECTION: google.com.br. 25 IN NS
ns3.google.com. google.com.br. 25 IN NS
ns1.google.com. google.com.br. 25 IN NS
ns4.google.com. google.com.br. 25 IN NS
ns2.google.com.
;; ADDITIONAL SECTION: ns1.google.com. 27 IN A
216.239.32.10 ns2.google.com. 26 IN A 216.239.34.10 ns3.google.com. 27 IN A 216.239.36.10 ns4.google.com. 26 IN A 216.239.38.10
;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Fri
Sep 26 17:46:54 2014 ;; MSG SIZE rcvd: 245
Tudo está funcionando bem.
Mas quando eu tento alguns hosts específicos, como Hotmail ou YouTube , ele falha:
dig www.hotmail.com @localhost
; <<>> DiG 9.8.1-P1 <<>> www.hotmail.com @localhost ;; global options:
+cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 56204 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0,
ADDITIONAL: 0
;; QUESTION SECTION: ;www.hotmail.com. IN A
;; Query time: 44 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Fri
Sep 26 17:48:41 2014 ;; MSG SIZE rcvd: 33
Mas, se eu tentar dig +tcp www.hotmail.com @localhost
, funciona:
; <<>> DiG 9.8.1-P1 <<>> +tcp www.hotmail.com @localhost ;; global
options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status:
NOERROR, id: 41319 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY:
5, ADDITIONAL: 5
;; QUESTION SECTION: ;www.hotmail.com. IN A
;; ANSWER SECTION: www.hotmail.com. 23 IN CNAME
dispatch.kahuna.glbdns2.microsoft.com.
dispatch.kahuna.glbdns2.microsoft.com. 23 IN A 65.55.85.12
dispatch.kahuna.glbdns2.microsoft.com. 23 IN A 157.55.104.76
;; AUTHORITY SECTION: hotmail.com. 26 IN NS
ns5.msft.net. hotmail.com. 26 IN NS
ns2.msft.net. hotmail.com. 26 IN NS
ns3.msft.net. hotmail.com. 26 IN NS
ns1.msft.net. hotmail.com. 26 IN NS
ns4.msft.net.
;; ADDITIONAL SECTION: ns5.msft.net. 25 IN A
65.55.226.140 ns2.msft.net. 25 IN A 208.84.2.53 ns3.msft.net. 25 IN A 213.199.180.53 ns1.msft.net. 25 IN A 65.55.37.62 ns4.msft.net. 25 IN A 208.76.45.53
;; Query time: 7 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Fri
Sep 26 17:49:58 2014 ;; MSG SIZE rcvd: 291
Alguém pode me ajudar?