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

Mark Andrews <marka@isc.org> Wed, 08 February 2017 06:02 UTC

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To: Ted Lemon <mellon@fugue.com>
From: Mark Andrews <marka@isc.org>
References: <CAH1iCiqXohb_7LsQ2EMo8ZB-t20mKq_nUDS8vebhtSXoM13DTg@mail.gmail.com> <20170203210922.7286C618213C@rock.dv.isc.org> <CAH1iCipKwcOsMQY3kjvSZ42LMK37GLD6GP2AVtnWK0c83k-RiA@mail.gmail.com> <20170207040552.8BDCC632F192@rock.dv.isc.org> <3581BE55-B178-4298-8EE8-73FD16B4216D@gmail.com> <D4C0D518-A3ED-4555-93DA-2EA12D82A662@fugue.com> <CAHw9_iK7Vt+ZNw8=E-b+w9gGhwB9fZNqHYp2pqKqT__RgcDttQ@mail.gmail.com> <5CA637EE-C0B6-4E5C-A446-A84431176D0C@fugue.com> <20170207205554.B6974633BE40@rock.dv.isc.org> <18F2EB0D-5BD0-4CC5-B02C-2E5EA0B8CC23@fugue.com> <20170207214846.B66EF633C6C5@rock.dv.isc.org> <FB835756-2C46-40A9-88ED-2F8ADF812BA6@fugue.com> <20170208052544.862956356F33@rock.dv.isc.org> <FFAFD844-824C-44EA-A4B1-1AD28B4FE95C@fugue.com>
In-reply-to: Your message of "Wed, 08 Feb 2017 00:44:16 -0500." <FFAFD844-824C-44EA-A4B1-1AD28B4FE95C@fugue.com>
Date: Wed, 08 Feb 2017 17:02:08 +1100
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Cc: "dnsop@ietf.org WG" <dnsop@ietf.org>, Brian Dickson <brian.peter.dickson@gmail.com>
Subject: Re: [DNSOP] ALT-TLD and (insecure) delgations.
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In message <FFAFD844-824C-44EA-A4B1-1AD28B4FE95C@fugue.com>, Ted Lemon writes:
>
> On Feb 8, 2017, at 12:25 AM, Mark Andrews <marka@isc.org> wrote:
> > And how does the server get the proof of non-existence?  It needs
> > to leak a query.
>
> If it has proof of non-existence for .alt cached, it doesn't need to ask
> any further questions to deny the existence of any subdomain of .alt.

Which assumes agggressive negative caching.   I'm going to make a
realistic assumption that it will take 10+ years for there to be
meaningful (>50%) deployment of aggressive negative caching.

> Leaking a query to .alt is harmless.

Is it?  What reports are we going to see over the next 20 year of
DITL data on *.alt.

Mark

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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