[RFCI-Discuss] wirralnews.com

[Alex van den Bogaerdt]

On Thu, Sep 06, 2007 at 10:58:22AM -0400, Derek J. Balling wrote:

> I understand that, but I can't just "jump to the end of the chain".  
> It's easy to decide that "in your head" and to see it logically, but  
> programatically, I am given "wirralnews.com". How can I tell WHO to  
> query? I ask the root servers. They give me some NS servers as a  
> starting point. But, I still have to ask THEM who the authoritative  
> servers are first. After all, maybe I've subdelegated the domain to  
> someone else, it's been known to happen.
> 
> And if THOSE servers tell me "there are no NS servers, sir", then I  
> have to believe them.

But if there are no NS servers, then any record has to be bogus, right?
That includes MX records.

Suggested programming:

Ask the root servers who to ask.  They return name servers.
Ask all of those servers for SOA and NS records.

If the authoritative answers give zero results, the zone does
not exist.  This means there cannot be MX records either. Any
MX answer has to be bogus.

just my 2ct