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Re: [DNSOP] Terminology question: split DNS

Jim Reid <jim@rfc1035.com> Mon, 19 March 2018 17:58 UTC

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From: Jim Reid <jim@rfc1035.com>
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Date: Mon, 19 Mar 2018 17:58:48 +0000
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To: Paul Hoffman <paul.hoffman@vpnc.org>
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Subject: Re: [DNSOP] Terminology question: split DNS
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> On 19 Mar 2018, at 17:47, Paul Hoffman <paul.hoffman@vpnc.org> wrote:
> 
> Some folks had reservations about the current definition of "split DNS":
>   "Where a corporate network serves up partly or completely different DNS inside and outside
>   its firewall. There are many possible variants on this; the basic point is that the
>   correspondence between a given FQDN (fully qualified domain name) and a given IPv4 address
>   is no longer universal and stable over long periods."
>   (Quoted from <xref target="RFC2775"/>, Section 3.8)
> 
> What would the WG like for this definition?

The quoted definition seems wrong: the binding of a name to address isn't necessarily unstable in split DNS setups. And that's not the only game in town either: for instance MX and NS records.

How about the following:

Where a corporate network serves up partly or completely different DNS data inside and outside its network. There are many possible variants on this; the basic point is that the
correspondence between a given QNAME/QTYPE/CLASS tuple and the data for that tuple is no longer universal and can depend on where the query is made from or which DNS server(s) are queried.

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