RoundRobin question

[Kevin Darcy]

William Stacey wrote:

>Same question.  How would you define that in the db and when would this ever
>be useful?
>
>  
>
Theoretically, it's useful for caching resolvers to distinguish between 
NXDOMAIN and NODATA responses, since an NXDOMAIN negative response 
applies to that node and everything beneath it. So, for example, if 
hairy.ape.com gets an NXDOMAIN, then there's no point in querying 
big.hairy.ape.com until the negative cache entry for hairy.ape.com 
expires. I don't know whether any caching resolvers actually implement 
this logic, however. But it's there to be used.

As for how one defines empty nodes in the database, I'm not sure whether 
you're asking what *resource*records* give rise to empty nodes (which 
Barry already described) or how BIND's internal data structures 
represent an empty node. If the latter, I'd recommend asking the BIND 
developers...

                                                                         
                                          - Kevin