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Re: [DNSOP] ALT-TLD and (insecure) delgations.

Stephane Bortzmeyer <bortzmeyer@nic.fr> Fri, 10 February 2017 09:11 UTC

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Date: Fri, 10 Feb 2017 10:10:54 +0100
From: Stephane Bortzmeyer <bortzmeyer@nic.fr>
To: Mark Andrews <marka@isc.org>
Message-ID: <20170210091054.ubhlgmbprwcosx4h@nic.fr>
References: <20170209163123.56hdbzaluekmvbh7@nic.fr> <20170209195722.DC1AB636586C@rock.dv.isc.org> <0394528C-99CD-41D4-9AB6-844D1318264C@gmail.com> <20170209204506.BC40D6365CBE@rock.dv.isc.org> <12D7473B-3A22-4A8D-9C13-2AEEDEABB879@fugue.com> <20170209224851.2FB1B63666E6@rock.dv.isc.org> <CAPt1N1nLmdoZ_3Kb8Kfp9sTsN-GYqo1A9CF3j4zb7QCvO3SLew@mail.gmail.com> <20170209232830.0DE1B63669D6@rock.dv.isc.org> <CFB6BEB2-4110-406A-A917-FC6361061B1C@fugue.com> <20170210004801.EEFE9636B89C@rock.dv.isc.org>
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Cc: "dnsop@ietf.org WG" <dnsop@ietf.org>, Ted Lemon <mellon@fugue.com>, Brian Dickson <brian.peter.dickson@gmail.com>
Subject: Re: [DNSOP] ALT-TLD and (insecure) delgations.
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On Fri, Feb 10, 2017 at 11:48:01AM +1100,
 Mark Andrews <marka@isc.org> wrote 
 a message of 36 lines which said:

> No, it will ask for foo.alt because:

This is false (and Ted Lemon was correct in describing QNAME
minimisation). Here, with a recent Unbound, when I ping foo.alt, I see only:

09:05:55.233366 IP6 2001:4b98:dc2:43:216:3eff:fea9:41a.64146 > 2a01:4f8:161:6106:1::10.53: 36407% [1au] A? alt. (32)

If, afterwards, I ping bar.alt, there is no outgoing DNS request (this
is because of "NXDOMAIN cut").

> QNAME minimisation prevents the root learning about foo.com because
> there is a delegation for com in the root zone.  This does not apply
> for foo.alt.

This does not seem true.

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