dots in cnames

[beetle bailey]

I'm glad this works, but I'm still a little confused.  Why would a resolver 
not look for information on the domain 'hostname.sub.dom.ain' if given an 
address www.hostname.sub.dom.ain?  I thought dots had a special function, 
kind of like a field separator, that would separate the different 
hierarchical levels in a name thereby making them bad choices for use in a 
hostname.


>From: Kevin Darcy <kcd at daimlerchrysler.com>
>To: bind-users at isc.org
>Subject: Re: dots in cnames
>Date: Tue, 05 Sep 2000 21:00:31 -0400
>
>
>beetle bailey wrote:
>
> > Say we have a server: hostname.sub.dom.ain and someone wanted to use
> > www.hostname.sub.dom.ain (someone created a presentation making use of  
>that
> > address).  Is there any reason I shouldn't create a CNAME for 
>www.hostname
> > in the zone file for sub.dom.ain pointing to hostname?  It seems like 
>that
> > should be a very bad thing to do, but I tried it and it works.
>
>Having a CNAME of www.hostname.sub.dom.ain pointing to hostname.sub.dom.ain
>doesn't violate the "CNAME and other data" rule, as long as no other 
>records
>exist for www.hostname.sub.dom.ain.
>
> > Then again
> > delegating a new subdomain for hostname.sub.dom.ain and adding an entry 
>for
> > www sounds like trouble as there's already a A record in sub.dom.ain for
> > hostname.sub.dom.ain.  Could I get some input on this?  Thanks.
>
>If you delegated hostname.sub.dom.ain and wanted to keep an A record for 
>that
>name, then you'd have to add the hostname.sub.dom.ain A record to the new 
>zone
>file. Once that was done, there'd be no problem creating a "www" CNAME in 
>the
>zone pointing to that A record, just as you might, e.g. create a
>www.example.com CNAME pointing to the example.com A record. You'd only run 
>into
>problems going the other way, i.e. creating a www.hostname.sub.dom.ain A 
>record
>and then trying to point a hostname.sub.dom.ain CNAME to it -- in that 
>case,
>the CNAME would conflict with the SOA and NS records for the zone.
>
>
>- Kevin
>
>
>

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