[dns-operations] resolvers considered harmful

Mark Allman mallman at icir.org
Thu Oct 23 19:29:41 UTC 2014

> There is no relationship between the data and the conclusion. Having a
> short TTL is not because you make changes often, it's because, when
> you decide to make a change, you want it to be effective rapidly. The
> actual number of changes does not matter, what matter are the
> expectations of users ("sorry, buddy, we made the change immediately
> but it will not be seen by all caches before one week").

I think that is totally fair.  But, two things ...

  - The TLDs are a little weird in that they are trying to control for
    their load and yet serving someone else's names.  So, yeah, there is
    this sort of mismatch where the SLDs would like shorter TTLs because
    they want the flexibility and don't pay the serving price.
    Meanwhile, the TLDs don't directly care about the flexibility and so
    they optimize for load shedding.  So, um, yeah ....

  - But, inside google.com this is all much more straightforward.  I.e.,
    they can be as flexible as they want to provision for.


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