[Pdns-users] FW: CNAME drives my crazy

Michael Mertel Michael.Mertel at bwc.de
Wed Feb 23 16:46:09 UTC 2005

Hi Bert,

thanks a bunch, allow-recursion-override did the job. I will have
a look how much impact this setting will have on performance.

Thanks again.



> -----Original Message-----
> From: bert hubert [mailto:ahu at ds9a.nl] 
> Sent: Wednesday, February 23, 2005 5:26 PM
> To: Michael Mertel
> Cc: pdns-users at mailman.powerdns.com
> Subject: Re: [Pdns-users] FW: CNAME drives my crazy
> On Wed, Feb 23, 2005 at 05:15:58PM +0100, Michael Mertel wrote:
> > sorry its me again, but I got no response to my initial post 
> > describing my CNAME problem.
> I didn't see it.
> > Am I totally lost here, do I try something beside the specs? We did 
> > this for ages with BIND, so I'am a bit confused.
> Without reading this all too well, I'd suggest setting: 
> allow-recursion-override=on
> allow-recursion-override=on|off
> "By specifying allow-recursion-override, local data even 
> about hosts that  don't exist will override the internet. 
> This allows you to generate zones  that don't really exist on 
> the internet. Does increase the number of SQL  queries for 
> hosts that truly don't exist, also not in your database. "
> > But I still get no ANSWER section in dig if I try
> > dig ANY www.mydomain.de
> Try +norecurs, I bet you'll see answers.
> The reason for this confusion is that PowerDNS first tries to 
> answers recursive questions from its own database. If it 
> finds that it cannot supply
> *all* data the client needs, which includes the right hand 
> side of CNAME expressions, it hands off the entire query to 
> the recursor, which then can't find yourdomani.
> I'm not entirely sure if the allow-recursion-override host 
> will help you in this case, let me know.
> Good luck!
> -- 
> http://www.PowerDNS.com      Open source, database driven DNS 
> Software 
> http://netherlabs.nl              Open and Closed source services

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