Re: ENUM Privacy (was RE: [Enum] User ENUM vs Operator ENUM)

[Marian Durkovic <md at bts.sk>]

Jim,

   I strongly disagree with your proposal to "overlay" public e164.arpa
by each telco with its own private tree. This would mean, that completely
unrelated and unathorized entities (i.e. telco X in country A) will be 
suggested to replace authoritative data from national (e.g. 1.2.4.e164.arpa) 
domain delegated by ITU/RIPE by any data (or garbage) they will. 
I think this undermines the basic principle of DNS operation, where only 
one entity is authoritative for a given domain and creates the state, 
where several thousand (!) different zone file versions could exist for 
the same domain. 

   IMHO different tree is a must here, and lookups into different
trees are supported in software now.

	With kind regards,

		M.




> From: Jim Reid
> Sent: 29 June 2004 19:22
> 
>     Christian> This suggests to me that you might get different
>     Christian> answers to an ENUM (e164.arpa) look up depending on
>     Christian> where you are?
> 
> Yes.
> 
>     Christian> How do you ensure that public e164.arpa has first
>     Christian> priority so that users public ENUM NAPTR records take
>     Christian> precedence over operator (private ENUM)?
> 
> You don't: that's a policy decision and implementation detail. And
> anyway who's to say whether the public or private tree takes
> precedence? Or even if precedence is appropriate? If my application is
> in some operator's net, it looks up <number>.e164.arpa in their
> private tree and the answer determines what the application
> does. Likewise if it's on the internet, the application will query the
> public e164.arpa tree and uses that answer. ie Where the application
> lives determines what name space it gets to see and what answer the
> application gets *for the same query*.
> 
> This is no different from how most big organisations do DNS today. If
> something's on the corporate intranet, they see the internal name
> space for example.com, complete with internal-only reachable web
> sites, mail servers and so on. When something's on the internet, they
> see the public face of example.com. That may or may not be very
> different from the internal name space.


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----   Marian Durkovic                       network  manager         ----
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----   Slovak Technical University           Tel: +421 2 524 51 301   ----
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