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Re: [DNSOP] [Doh] Alternate proposal for transport indication in draft-ietf-dnsop-dns-wireformat-http

Ted Lemon <mellon@fugue.com> Tue, 03 April 2018 17:55 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Tue, 03 Apr 2018 13:54:57 -0400
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Cc: dnsop <dnsop@ietf.org>
To: Dave Lawrence <tale@dd.org>
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Subject: Re: [DNSOP] [Doh] Alternate proposal for transport indication in draft-ietf-dnsop-dns-wireformat-http
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On Apr 3, 2018, at 1:00 PM, Dave Lawrence <tale@dd.org> wrote:
> That testing TCP capabilities part is a distraction from the core
> motivation.  The request makes sense from a dumb transparent proxy
> point of view, where there's a regular DNS resolver on the one end who
> just wants to be able to get DNS messages through an HTTPS tunnel.
> Media type isn't the right way to achieve that, but the key idea is sound.

This didn't actually clear things up for me.   I think that what you mean is that you don't want the tunnel server to do truncation detection and retry over TCP—is that right?   If so, that's a point worth discussing explicitly.   I think you could make arguments for both positions. Given that you're doing DNS-over-HTTP-over-SSL-over-TCP here, the tunnel server definitely could do truncation detection and retry, and that would probably perform better.   Also, if it's a DNS server that's just consulting its cache, doing truncation is just a waste of time.

But possibly I misunderstood your point?

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