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DNS over...

DNS over DONUTS

DONUTS expands to “DNS over normal, unencrypted TCP streams”: a deliberately literal reminder that DNS can run over a simple stream transport.

DONUTStransportnovelty

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Screenshot used in the talk for DNS over DONUTS
Screenshot used in the original talk.

DONUTS means DNS over normal, unencrypted TCP streams. The example treats a generic TCP connection as the transport below DNS.

It is a useful reminder that a DNS transport can be technically simple and still unusual in practice. The name is also very good.