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Re: [DNSOP] comments on draft-ietf-dnsop-dns-terminology-03

John Dickinson <jad@sinodun.com> Wed, 15 July 2015 10:00 UTC

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Subject: Re: [DNSOP] comments on draft-ietf-dnsop-dns-terminology-03
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On 14/07/2015 17:26, Casey Deccio wrote:
> On Tue, Jul 14, 2015 at 12:00 PM, Paul Hoffman <paul.hoffman@vpnc.org
> <mailto:paul.hoffman@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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