@qyliss I'm glad you're thinking and working and writing about these issues!
One concern I have with all the proposals I've seen for don't-trust-local-dns is that they make many kinds of network optimization more difficult. For example streaming popular videos (netflix or whatever) should happen between the endpoint and a city-local cdn server, not longhauling the stream from Boston to Berlin just because that's where the DNS resolution happened. The last time I built a service with streaming in it, we found that local cdn nodes improved the user experience enormously.
There are ways around this impact, but they're all quite a bit of work, and I'd like to see DoX (dns over whatever) proposal discussions that acknowledge the challenges that will occur due to the proposed solution...
@eqe my naive idea would be to do this at layers above DNS. If, say, you have a web page displaying video, your web server could use the connecting IP to determine a nearby server to load the video from.
But interesting point that I hadn’t considered. Thank you.
@qyliss glad to be helpful!
One solution is for the cdn to operate with tcp over anycast IP, rather than unicast, so that the network-nearest server cluster can respond to a globally used IP. Back in the day you'd have an IP cluster for the Boston cdn and a different IP range for the Berlin cdn and use dns to send user requests to the right geo, but I guess the modern way is to have a consistent name-to-IP mapping and do the geo routing at the BGP layer instead. Doing this is a deep pile of black magic to most engineers, though. So I don't know if it's now standard in the cdn market or if only the more advanced ones do anycast.
The approach you mention is doable for media streams too, send a 204 or whatever redirecting the request to a network-closest server name. That has more round-trips at the start which is fine if your streams are more than a few dozen seconds. Might be a problem for Vine :)
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