Re: [DNSOP] Fwd: New Version Notification for draft-bellis-dnsext-multi-qtypes-04.txt

Paul Wouters <paul@nohats.ca> Tue, 04 July 2017 19:25 UTC

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Date: Tue, 4 Jul 2017 15:25:37 -0400 (EDT)
From: Paul Wouters <paul@nohats.ca>
To: Dave Lawrence <tale@dd.org>
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Subject: Re: [DNSOP] Fwd: New Version Notification for draft-bellis-dnsext-multi-qtypes-04.txt
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On Tue, 4 Jul 2017, Dave Lawrence wrote:

> While for my own imagined use cases three is adequate, such as for
> querying MX, A and AAAA simultaneously, I also don't see any
> compelling reason to drop it from his proposed seven.  In my own
> scheme I had planned on using a NSEC-like type bitmap, but having
> spoken with Ray about this a while ago I know he's not keen on that.

I think the bitmap would be great. Limiting it to some artificial
special record types just causes people to avoid new records and
abuse existing records.

> To me the focus on answer size amplification is misdirected.  I am far
> more concerned about packet count than packet size, and in any event
> constraining this option to only verified channels makes it
> immediately less useful.

Yes, reducing packet count and roundtrips is the obvious goal we all
want, but we also want to avoid paying a DDOS price for it.

Paul