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antonwork2011-10-04 22:37:47
Domain Name System
antonwork, 2011-10-04 22:37:47

Understand interaction - google public dns and jquery CDN - conspiracy? :)?

You all heard about "Google public DNS", habrahabr.ru/blogs/google/77199/ and code.google.com/intl/ru/speed/public-dns/
And about jQuery-CDN code.jquery.com

Noticed that many sites work with errors, namely jquery is not loaded. I began to understand, I execute a dns request on my home computer:

$ host -v code.jquery.com 8.8.8.8<br/>
Trying &quot;code.jquery.com&quot;<br/>
Received 33 bytes from 8.8.8.8#53 in 125 ms<br/>
Trying &quot;code.jquery.com&quot;<br/>
Using domain server:<br/>
Name: 8.8.8.8<br/>
Address: 8.8.8.8#53<br/>
Aliases: <br/>
<br/>
Host code.jquery.com not found: 2(SERVFAIL)<br/>
Received 33 bytes from 8.8.8.8#53 in 85 ms


I can't explain the behavior of the DNS server. At the same time, the commands

$ host code.jquery.com 8.8.4.4 (этой другой dns сервер гугла)<br/>
$ host code.jquery.com &lt;ip любых других dns&gt;


give the correct address!

Of course, I understand that everyone has their own 8.8.8.8, but judging by the ping (~ 50 ms), the closest one to me is actually very far away, there is an assumption that it is the same for Russia, i.e. located in one DC.

I assume that my wifi router fails or a cheeky provider cuts packets, I go to the server (I rent from hetzner) and I also cannot query the address "code.jquery.com" from google-public-dns "8.8.8.8". The result is one to one.

And further. It looks like the problem is floating.
What is it? Failure? Too clever in jquery? Sabotage?

And for information, another request from the server:

$ dig code.jquery.com @8.8.8.8<br/>
<br/>
; &lt;&lt;&gt;&gt; DiG 9.6-ESV-R4 &lt;&lt;&gt;&gt; code.jquery.com @8.8.8.8<br/>
;; global options: +cmd<br/>
;; Got answer:<br/>
;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: SERVFAIL, id: 61649<br/>
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0<br/>
<br/>
;; QUESTION SECTION:<br/>
;code.jquery.com. IN A<br/>
<br/>
;; Query time: 8 msec<br/>
;; SERVER: 8.8.8.8#53(8.8.8.8)<br/>
;; WHEN: Tue Oct 4 23:38:38 2011<br/>
;; MSG SIZE rcvd: 33

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romik, 2011-10-04
@romik

Official site: Dont getting stylesheets for jQuery website

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