Details about Round robin behaviour ??

mathieu.millet at mathieu.millet at
Thu Mar 3 08:09:03 UTC 2005

> -----Message d'origine-----
> From : Kevin Darcy [mailto:kcd at] 
> Sent : jeudi 3 mars 2005 00:19
> To : bind-users at
> Object : Re: Details about Round robin behaviour ??
> mathieu.millet at wrote:
> >	Hi everyone,
> >
> >I'm interesting in getting details about the behaviour of round robin 
> >feature in Bind.
> >
> >More specially, can somebody tell me precisely :
> >	- The default behaviour of Bind when you have multiple identical 
> >RRsets with Bind 9.2.3+ and Bind 9.3.x ? Are all RRsets returned ? If 
> >yes, in which order ?
> >
> The default behavior of BIND is to filter out duplicate RRs. This is 
> mandated by RFC 2181, Section 5. That's the answer to your first 
> question, and renders the other 2 questions meaningless.

OK. Wrong term. So my question is : what is the default behaviour of BIND
when you have multiple RRs with the same label, class and type (but not
data) with Bind 9.2.3+ and Bind 9.3.x (Remember I have asked questions about
Round Robin) ? ...

> >	- What is the support status of the option rrset-order (and
> >orderclass) with Bind 9.2.3+ and Bind 9.3.x ?
> >	- What does "rrset-order in more complete." mean (specified in Bind 
> >9.3 Changes) ?
> >
> >I have already looked at Bind ARM and DNS&BIND from O'Reilly and I 
> >can't find a conclusive answer to these questions (Maybe I didn't 
> >understand the answers in these books ;o).
> >
> Instead of asking these speculative questions, why don't you just 
> configure what you want to configure and see if those 
> versions of BIND 
> behave they way you want them to? Sometimes an ounce of real-world 
> testing and verification is worth a ton of code description and/or 
> explanation...

Sorry, but I'm getting confused with the behaviour of several Bind versions
(I have tested) and I would like to have an answer from a Bind expert. Also,
since I didn't find these informations in documentation and in archives, it
would be a good idea to leave a trace for such questions.

Thanks anyway for your answer.

Sincerely yours,
Mathieu MILLET.

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