CNAME from Subdomain to main domain-name.

[Kevin Darcy]

Beavis wrote:
> Greetings,
>
>  Just wanted to ask if this is a possible scenario.
>
>
> domain.com. IN CNAME        www
> www             IN CNAME        myserver.beta.domain.com.
>   

I assume domain.com is the "apex" name of a _zone_, right?

If so, then the above is illegal. Why? Because at the apex of a zone you 
have an SOA record and at least 2 NS records. The rule is: you can't 
have a CNAME at a node if there is other data present at that node. So 
the presence of the SOA/NS records forbid the creation of the CNAME. 
You'll get a "CNAME and other data" error if you try this.

It is, however, perfectly legal and acceptable for www.domain.com to own 
a CNAME pointing at a zone apex, or any other name that does not itself 
own a CNAME, -unless- www.domain.com is itself a subzone of domain.com.

Short version of answer: you can't CNAME the apex of a zone.

                                                                         
            - Kevin