[dns-operations] Google Chrome Pre-Caching

Michael Sinatra michael at rancid.berkeley.edu
Thu Sep 4 00:22:49 UTC 2008

On 09/03/08 14:43, Wiliam F. Maton Sotomayor wrote:
> On Wed, 3 Sep 2008, Duane Wessels wrote:
>> On Wed, 3 Sep 2008, Chris Roosenraad wrote:
>>> www.cn
>>> www.cnn.co
>>> www.cnn.com
>>> Similar behavior is seen for other requests (www.news.com, www.espn.com,
>>> www.timewarner.com, etc).
>> Oh my.
> Indeed.  My question is if there's a sluggish DNS response, will the 
> users start to collectively cry that 'their Internet is down' and flood 
> the support lines?  Or perhaps users will think in those cases that 
> Google Chrome is just to slow and part with it....
> I shudder to think what effect it has with internationalized DNS. :-)

Here's another one to check out:


If your users tend to browse sites with lots of links, or if their 
default pages are have lots of links, your customer-facing DNS servers 
will get lots of DNS queries.  We were able to verify the behavior by 
having my boss load the default page for www.berkeley.edu.  His machine 
immediately queried for the hostnames for *all* of the links on that 
page, even though he visited not one of them.

I don't know if any other browsers do this, but Firefox for *BSD 
definitely appears not to, and I suspect few others do.


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