[dns-operations] question for geo-based response

[manu tman]

Hi Lauren,

On Wed, Jul 11, 2018 at 8:33 PM Dave Lawrence <tale at dd.org> wrote:

> Lauren C. writes:
> > How open resolver returns different results for the same query against
> > different client location?
>
> EDNS Client Subnet.
> https://tools.ietf.org/html/rfc7871



As a matter of fact google DNS indeed uses ECS, which allows us (FB) to
provide a more accurate answer based on the subnet that is provided by ECS.
Without ECS, we would regardless be able to provide some decent answer,
albeit less granular, to the query, because while you are performing a
query against 8.8.8.8, we will see the query coming from google servers in
HKG or somewhere close to where the query is originating, allowing us to
provide a customize answer based on that. see section ”location of IP
address ranges google public dns uses to send queries” in
https://developers.google.com/speed/public-dns/faq

I gave a talk at DNS OARC 28 where the first part covers how we determine
the response to send back
https://m.youtube.com/watch?v=KneUC9EnIgg

Manu


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