<div><div><br></div><div><div dir="auto">Hi Lauren,</div><br><div class="gmail_quote"></div></div></div><div><div><div class="gmail_quote"><div dir="ltr">On Wed, Jul 11, 2018 at 8:33 PM Dave Lawrence <<a href="mailto:tale@dd.org" target="_blank">tale@dd.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Lauren C. writes:<br>
> How open resolver returns different results for the same query against <br>
> different client location?<br>
<br>
EDNS Client Subnet.<br>
<a href="https://tools.ietf.org/html/rfc7871" rel="noreferrer" target="_blank">https://tools.ietf.org/html/rfc7871</a></blockquote><div dir="auto"><br></div><div dir="auto"><br></div></div></div></div><div><div><div class="gmail_quote"><div dir="auto">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 <div><a href="https://developers.google.com/speed/public-dns/faq">https://developers.google.com/speed/public-dns/faq</a></div><div dir="auto"><br></div><div dir="auto">I gave a talk at DNS OARC 28 where the first part covers how we determine the response to send back</div><div dir="auto"><div><a href="https://m.youtube.com/watch?v=KneUC9EnIgg">https://m.youtube.com/watch?v=KneUC9EnIgg</a></div><br></div><div dir="auto">Manu</div><div dir="auto"><br></div><div dir="auto"><br></div></div></div></div></div><div><div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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