me@ubuntu:# dig @8.8.8.8 google.com
; <<>> DiG 9.9.2-P2 <<>> @8.8.8.8 google.com
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached
me@ubuntu:# dig @8.8.8.8 google.com +tcp
; <<>> DiG 9.9.2-P2 <<>> @8.8.8.8 google.com +tcp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60080
;; flags: qr rd ra; QUERY: 1, ANSWER: 16, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;google.com. IN A
;; ANSWER SECTION:
google.com. 300 IN A 46.28.247.93
google.com. 300 IN A 46.28.247.104
google.com. 300 IN A 46.28.247.113
google.com. 300 IN A 46.28.247.98
google.com. 300 IN A 46.28.247.114
google.com. 300 IN A 46.28.247.84
google.com. 300 IN A 46.28.247.119
google.com. 300 IN A 46.28.247.109
google.com. 300 IN A 46.28.247.89
google.com. 300 IN A 46.28.247.88
google.com. 300 IN A 46.28.247.108
google.com. 300 IN A 46.28.247.99
google.com. 300 IN A 46.28.247.118
google.com. 300 IN A 46.28.247.94
google.com. 300 IN A 46.28.247.103
google.com. 300 IN A 46.28.247.123
;; Query time: 33 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue May 7 22:51:45 2013
;; MSG SIZE rcvd: 295
和：
me@ubuntu:# dig google.com +tcp
;; Connection to 192.168.1.1#53(192.168.1.1) for google.com failed: connection refused.
; <<>> DiG 9.9.2-P2 <<>> google.com +tcp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 51835
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;google.com. IN A
;; Query time: 1 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Tue May 7 22:52:06 2013
;; MSG SIZE rcvd: 28
me@ubuntu:# dig google.com
; <<>> DiG 9.9.2-P2 <<>> google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13226
;; flags: qr rd ra; QUERY: 1, ANSWER: 16, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;google.com. IN A
;; ANSWER SECTION:
google.com. 268 IN A 46.28.247.93
google.com. 268 IN A 46.28.247.104
google.com. 268 IN A 46.28.247.113
google.com. 268 IN A 46.28.247.98
google.com. 268 IN A 46.28.247.114
google.com. 268 IN A 46.28.247.84
google.com. 268 IN A 46.28.247.119
google.com. 268 IN A 46.28.247.109
google.com. 268 IN A 46.28.247.89
google.com. 268 IN A 46.28.247.88
google.com. 268 IN A 46.28.247.108
google.com. 268 IN A 46.28.247.99
google.com. 268 IN A 46.28.247.118
google.com. 268 IN A 46.28.247.94
google.com. 268 IN A 46.28.247.103
google.com. 268 IN A 46.28.247.123
;; Query time: 53 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Tue May 7 22:52:17 2013
;; MSG SIZE rcvd: 295
问题：我能做什么，检查吗？
答案1
看起来您对 LAN 外部端口 53 的访问已被阻止 - 这在企业网络上并不罕见。