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Re: Services and top-level DNS names (was: Re: Update of RFC 2606

John Levine <johnl@iecc.com> Mon, 07 July 2008 02:12 UTC

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Date: Sun, 06 Jul 2008 22:12:53 -0400
From: John Levine <johnl@iecc.com>
To: Mark Andrews <Mark_Andrews@isc.org>
Subject: Re: Services and top-level DNS names (was: Re: Update of RFC 2606
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> 	The problem is that user@ai is not globally unique.
>
> 	MIT users will have problems talk to user@ai when "ai" means
> 	Anguilla.  The is a current security issue.
>
> 	If / when MIT stop using ai.mit.edu, "user@ai" will not longer
> 	mean user@ai.mit.edu.  This will mean that any configuration file
> 	that has "user@ai" will now, suddenly, get a different meaning.
> 	This is a latent security issue.

If by "latent" you mean "so obscure that in the ten years that there's 
been A and MX records at TLDs nobody's been affected" I guess I agree.

R's,
John
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