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If any reader of this list is sending DNS requests with the EDNS Client
Subnet (ECS) option to 8.8.8.8, please read this post on our announcement
list <https://groups.google.com/g/public-dns-announce/c/h4XLjnWvAp8> that
discusses changes Google is planning in how we handle requests with ECS. It
is also relevant for developers of software that sends ECS to recursive
resolvers.
To be quite clear, these planned changes are only in our handling of
requests sent with ECS, not in how Google Public DNS sends ECS to
authoritative name servers.
For anyone interested in ECS, the Case Western / Akamai paper
<https://www.akamai.com/us/en/multimedia/documents/technical-publication/a-look-at-the-ecs-behavior-of-dns-resolvers.pdf>
is
well worth reading in full; in particular section 8 on ECS Pitfalls, some
of which our planned changes hope to address and discourage in clients that
send ECS to recursive resolvers.
<https://www.akamai.com/us/en/multimedia/documents/technical-publication/a-look-at-the-ecs-behavior-of-dns-resolvers.pdf>
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