CentOS 6.3 BIND 版本 9.8.2
服务器充当我的本地网络的 DNS 服务器。
发生的情况是，我可以正常解析 jquery.com，但是从本地主机查询时访问 code.jquery.com 却找不到任何内容。
dig jquery.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.5 <<>> jquery.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38326
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 6, ADDITIONAL: 6
;; QUESTION SECTION:
;jquery.com. IN A
;; ANSWER SECTION:
jquery.com. 3600 IN A 70.32.120.34
;; AUTHORITY SECTION:
jquery.com. 168983 IN NS ns11.dnsmadeeasy.com.
jquery.com. 168983 IN NS ns14.dnsmadeeasy.com.
jquery.com. 168983 IN NS ns13.dnsmadeeasy.com.
jquery.com. 168983 IN NS ns15.dnsmadeeasy.com.
jquery.com. 168983 IN NS ns10.dnsmadeeasy.com.
jquery.com. 168983 IN NS ns12.dnsmadeeasy.com.
;; ADDITIONAL SECTION:
ns10.dnsmadeeasy.com. 84449 IN A 208.94.148.4
ns11.dnsmadeeasy.com. 84449 IN A 208.80.124.4
ns12.dnsmadeeasy.com. 84449 IN A 208.80.126.4
ns13.dnsmadeeasy.com. 84449 IN A 208.80.125.4
ns14.dnsmadeeasy.com. 84449 IN A 208.80.127.4
ns15.dnsmadeeasy.com. 84449 IN A 208.94.149.4
;; Query time: 75 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Oct 30 11:09:55 2012
;; MSG SIZE rcvd: 266
然后：
dig code.jquery.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.5 <<>> code.jquery.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12717
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;code.jquery.com. IN A
;; ANSWER SECTION:
code.jquery.com. 43118 IN CNAME wac.1257.edgecastcdn.net.
wac.1257.edgecastcdn.net. 3518 IN CNAME ne.wac.edgecastcdn.net.
ne.wac.edgecastcdn.net. 3518 IN A 93.184.220.20
;; Query time: 80 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Oct 30 11:10:45 2012
;; MSG SIZE rcvd: 108
然后：
dig jquery.com @localhost
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.5 <<>> jquery.com @localhost
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10420
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 6, ADDITIONAL: 6
;; QUESTION SECTION:
;jquery.com. IN A
;; ANSWER SECTION:
jquery.com. 3501 IN A 70.32.120.34
;; AUTHORITY SECTION:
jquery.com. 168884 IN NS ns12.dnsmadeeasy.com.
jquery.com. 168884 IN NS ns10.dnsmadeeasy.com.
jquery.com. 168884 IN NS ns14.dnsmadeeasy.com.
jquery.com. 168884 IN NS ns13.dnsmadeeasy.com.
jquery.com. 168884 IN NS ns15.dnsmadeeasy.com.
jquery.com. 168884 IN NS ns11.dnsmadeeasy.com.
;; ADDITIONAL SECTION:
ns10.dnsmadeeasy.com. 84350 IN A 208.94.148.4
ns11.dnsmadeeasy.com. 84350 IN A 208.80.124.4
ns12.dnsmadeeasy.com. 84350 IN A 208.80.126.4
ns13.dnsmadeeasy.com. 84350 IN A 208.80.125.4
ns14.dnsmadeeasy.com. 84350 IN A 208.80.127.4
ns15.dnsmadeeasy.com. 84350 IN A 208.94.149.4
;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Oct 30 11:11:34 2012
;; MSG SIZE rcvd: 266
这是让我困惑的地方：
dig code.jquery.com @localhost
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.5 <<>> code.jquery.com @localhost
;; global options: +cmd
;; connection timed out; no servers could be reached
答案1
由于某种原因，您的本地绑定无法到达 edgecastcdn.net。虽然谷歌能联系他们。尝试dig @localhost edgecastcdn.net一下dig @ns1.edgecastcdn.net edgecastcdn.net- 您可能会收到相同的超时消息。
这可能是他们的配置错误问题，或者是 edgecastcdn.net 上某些 DDOS 攻击的副作用，或者类似的东西。