Sorry for the top-post. As I understand things, this is more than a "choice". 
RFC 2181 requires it, I think, no?

-- 
Andrew Sullivan 
Please excuse my clumbsy thums. 

> On Jul 15, 2015, at 06:00, John Dickinson <j...@sinodun.com> wrote:
> 
> 
> 
>> On 14/07/2015 17:26, Casey Deccio wrote:
>> On Tue, Jul 14, 2015 at 12:00 PM, Paul Hoffman <paul.hoff...@vpnc.org
>> <mailto:paul.hoff...@vpnc.org>> wrote:
>> 
>>    On 13 Jul 2015, at 14:20, Casey Deccio wrote:
>> 
>> 
>>        4. In the definition of RRset, the bit about TTLs needing to be
>>        the same
>>        seems out of place for this terminology document.  That is an
>>        operational
>>        requirement.
>> 
>> 
>>    Disagree. To some people, TTLs are operational, to others they are
>>    part of the master file format. For the latter, this sameness
>>    applies to the definition.
> 
> No, the zone file can contain different TTLs. As far as I know most 
> implementations choose to reduce the TTLs for all RRs in an RRSet to the 
> lowest value.
> 
>> 
>> What I am saying is that whether the TTLs are the same (correct) or the
>> TTLs are different (incorrect), it doesn't change the definition of
>> RRset, which is the set of RRs with the same name/class/type.  Therefore
>> the requirement that the TTL be the same is not a useful statement for
>> the definitions doc, whether it's operational or standards-based.
> 
> I agree.
> John
> 
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