On Tue, Jun 11, 2019 at 8:46 AM <[email protected]> wrote:
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Domain Name System Operations WG of the
> IETF.
>
> Title : Considerations for Large Authoritative DNS
> Servers Operators
> Authors : Giovane C. M. Moura
> Wes Hardaker
> John Heidemann
> Marco Davids
> Filename :
> draft-moura-dnsop-authoritative-recommendations-04.txt
> Pages : 17
> Date : 2019-06-11
>
> Abstract:
> This document summarizes recent research work exploring DNS
> configurations and offers specific, tangible considerations to
> operators for configuring authoritative servers.
>
> This document is not an Internet Standards Track specification; it is
> published for informational purposes.
>
> Ed note
>
> This draft will be renamed to draft-moura-dnsop-large-authoritative-
> considerations in case adpoted by the WG, to reflect the new title.
>
> Text inside square brackets ([RF:ABC]) refers to:
>
> o individual comments we have received about the draft, and
> enumerated under <https://github.com/gmmoura/draft-moura-dnsop-
> authoritative-recommendations/blob/master/reviews/reviews-
> dnsop.md>.
>
> o Issues listed on our Github repository
>
> Both types will be removed before publication.
>
> This draft is being hosted on GitHub - <https://github.com/gmmoura/
> draft-moura-dnsop-authoritative-recommendations>, where the most
> recent version of the document and open issues can be found. The
> authors gratefully accept pull requests.
>
>
> The IETF datatracker status page for this draft is:
>
> https://datatracker.ietf.org/doc/draft-moura-dnsop-authoritative-recommendations/
>
> There are also htmlized versions available at:
>
> https://tools.ietf.org/html/draft-moura-dnsop-authoritative-recommendations-04
>
> https://datatracker.ietf.org/doc/html/draft-moura-dnsop-authoritative-recommendations-04
>
> A diff from the previous version is available at:
>
> https://www.ietf.org/rfcdiff?url2=draft-moura-dnsop-authoritative-recommendations-04
>
>
In section "7. C5: Consider longer time-to-live values whenever possible"
o Longer caching results in faster responses, given that cache hits
are faster than cache misses in resolvers. [Moura19a
<https://tools.ietf.org/html/draft-moura-dnsop-authoritative-recommendations-04#ref-Moura19a>]
shows that
the change in TTL for .uy TLD from 1 day to 5 minutes reduced the
RTT from 15k Atlas vantage points significantly: the median was
reduced from 28.7ms to 8ms, while the 75%ile decreased from 183ms
to 21ms.
I don't understand how changing to a shorter TTL (from 1 day to 5 minutes)
reduced the RTT. Seems backwards.
--
Bob Harold
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