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Re: [DNSOP] Terminology question: split DNS

Ted Lemon <mellon@fugue.com> Tue, 20 March 2018 13:57 UTC

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From: Ted Lemon <mellon@fugue.com>
Date: Tue, 20 Mar 2018 13:57:04 +0000
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To: Andrew Sullivan <ajs@anvilwalrusden.com>
Cc: dnsop WG <dnsop@ietf.org>
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Subject: Re: [DNSOP] Terminology question: split DNS
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I think split horizon is really specific to source address, but I agree
with your clarification as it applies to views. Also agree that we should
mention all variants.

On Mar 20, 2018 13:52, "Andrew Sullivan" <ajs@anvilwalrusden.com> wrote:

> On Mon, Mar 19, 2018 at 05:58:08PM +0000, Ted Lemon wrote:
> >   Where DNS servers that are authoritative for a particular set of
> domains
> >   provide partly or completely different answers in those domains
> depending
> >   on the source of the query.   The effect of this is that a domain name
> that
> >   is notionally globally unique nevertheless has different meanings for
> >   different network users.
>
> I mostly like that, but I quibble with "source of the query".  It's
> really "depending on some factor apart from the name, class, and type
> of the query.  For instance, the answers might differ according to the
> source of the query."  EDNS client subnet is another example, but I've
> also seen things based on authentication (SIG(0) or TSIG).
> Effectively, every "DNS tricks" service on the public Internet is also
> a kind of split horizon.
>
> I think we should include all of "split DNS", "split horizon", and
> "split brain": they're all terms I've heard and so we ought to make
> sure they're both included.
>
> A
>
> --
> Andrew Sullivan
> ajs@anvilwalrusden.com
>
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