[sf-lug] multiple dns lookups for one page?

Rick Moen rick at linuxmafia.com
Thu Apr 15 11:18:56 PDT 2010

Quoting Andrew E (andrewevansc at gmail.com):


[RM: snip server URL and related text, which I'm pretty sure were the 
only confidential parts]

> Firebug shows me a whole bunch of DNS lookups. Does it look like that IPv6
> vs IPv4 issue? I'm unfamiliar with how to diagnose issues with these
> protocols or DNS in general. Here is a phpinfo() about the server
> http://native-instinct.com/portfolio/info.php if that helps.

As Nathan said, and I was implying, Firebug is reporting what's going on
at the machine where _Firebug_ is running, which is where your Web
browser is -- which Web browser I believe would be Firefox, right?  

So, the real question you should be asking yourself is, where's your 
Web-browsing machine (the machine you're running your -browser- on) 
consulting for DNS?  Is the Web-browsing machine attempting IPv6-enabled
DNS and falling back to IPv4-based queries when those fail?

One quick way to check is to install Unbound, an IP6-enabled open-source
recursive nameserver available for Unixes (including Linux and OS X) and
MS-Windows, pointing your machine at it for nameservice, and seeing if
the problem goes away.

The URL I posted earlier details how.

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