RoundRobin question

Barry Margolin barmar at alum.mit.edu
Fri May 21 02:11:20 UTC 2004


In article <c8j1kh$1jv7$1 at sf1.isc.org>,
 "William Stacey" <staceyw at mvps.org> wrote:

> Thanks for the reply Barry.  However I am confused.  Would this not be node
> "www.division1.mycompany.com" in the zone with one rrSet (A type) containing
> two A records?  Unless they are actually creating a node "division1" in the
> zone which contains the "www" node.  Not sure this kind of pysical node tree
> would be required if you just used a hash table for the ownerNames.  Maybe
> so...

There's a node in the DNS hierarchy for each label.  The node for 
www.division1.mycompany.com has two A records, but above that in the 
hierarchy there's a node for division1.mycompany.com that has no records 
at all.

> 
> -- 
> William Stacey
> 
> "Barry Margolin" <barmar at alum.mit.edu> wrote in message
> news:c8gvf0$2d0g$1 at sf1.isc.org...
> > In article <c8grsu$2969$1 at sf1.isc.org>,
> >  "William Stacey" <staceyw at mvps.org> wrote:
> >
> > > Same question.  How would you define that in the db and when would this
> ever
> > > be useful?
> >
> > Suppose you have a domain mycompany.com.  You might have web servers for
> > different divisions, www.division1.mycompany.com,
> > www.division2.mycompany.com, etc.  In the zone file you would enter:
> >
> > www.division1 IN A <address>
> > www.division2 IN A <address>
> >
> > > -- 
> > > William Stacey
> > >
> > > "Kevin Darcy" <kcd at daimlerchrysler.com> wrote in message
> > > news:c8gbrb$1pjp$1 at sf1.isc.org...
> > > > William Stacey wrote:
> > > >
> > > > >>but underneath each name is 0 or more RRsets, and then even within
> an
> > > > >>
> > > > >>
> > > > >
> > > > >Wanted to ask this question before as I saw it in the rfc.  When/how
> > > would a
> > > > >0 length node be valid or needed?
> > > > >TIA
> > > > >
> > > > There is such a thing as an "empty non-terminal node". E.g. if
> > > > big.hairy.ape.com owns records, but hairy.ape.com does not, then
> > > > hairy.ape.com would be considered an empty non-terminal node. The
> reason
> > > > the nameserver needs to keep track of empty non-terminals is because
> > > > those names actually _do_ exist, but don't happen to own any records.
> > > > Queries for such a name would therefore return NODATA (a pseudo-RCODE
> > > > consisting of a NOERROR RCODE and 0 answers) instead of NXDOMAIN.
> > > >
> > > >
> > > >                                                       - Kevin
> > > >
> > > >
> > > >
> >
> > -- 
> > Barry Margolin, barmar at alum.mit.edu
> > Arlington, MA
> > *** PLEASE post questions in newsgroups, not directly to me ***
> >

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***


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