A record of domain name must be name server ?

Kevin Darcy kcd at chrysler.com
Wed Sep 10 22:13:21 UTC 2014

No, what I'm saying is that if

example.com owns an A record, and
www.example.com owns an A record, then

where does point?

Some people will point it at example.com, some will point it at 
www.example.com. What you get is a mish-mosh. No consistency.

If, on the other hand, www.example.com is a CNAME to example.com, then 
it's crystal clear where the reverse record will point -- example.com. 
There is no ambiguity or option for inconsistency.

     - Kevin

On 9/10/2014 5:48 PM, Eliezer Croitoru wrote:
> Hey Kevin,
> This is not an issue at all.
> A PTR is different then a "A" record and can be used by two reverse 
> domain names and only the owner of the IP addresses space can define 
> them.
> I am not sure if two PTR records for two domains will be applied to 
> one IP but it is possible for two IP addresses to have the same PTR.
> Can we even use a CNAME as a PTR???
> Eliezer
> On 09/11/2014 12:37 AM, Kevin Darcy wrote:
>> Also, have you considered the forward/reverse ambiguity that arises when
>> multiple owner names resolve to the same address? To which of those
>> names does the PTR point?
>>      - Kevin
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