Re: [Doh] WG Review: DNS Over HTTPS (doh)

Tony Finch <dot@dotat.at> Fri, 22 September 2017 12:12 UTC

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Date: Fri, 22 Sep 2017 13:12:48 +0100
From: Tony Finch <dot@dotat.at>
To: Ted Hardie <ted.ietf@gmail.com>
cc: Mark Nottingham <mnot@mnot.net>, doh@ietf.org, IETF <ietf@ietf.org>
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Subject: Re: [Doh] WG Review: DNS Over HTTPS (doh)
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Ted Hardie <ted.ietf@gmail.com> wrote:

> I think you're underestimating the value of a switch to a multiplexing
> facilitating protocol/transport.  Once this has gotten its legs under it, I
> suspect that this approach for connecting to caching resolver will perform
> better than any of traditional upd/tcp connections or the tls/dtls
> approaches DPRIVE created.

DNS over TCP already supports out-of-order responses. The reason it has
historically not performed very well is that server implementations have
handled queries on a TCP connection serially rather than concurrently.

But this is improving. BIND 9.11 (for example) supports concurrent queries
with out-of-order responses over TCP and TCP fast open, so queries over
TCP should perform well, and better than UDP for large responses.

Tony.
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