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Re: [certid] What DNS-ID if also using a DNS-SRV?

Shumon Huque <shuque@isc.upenn.edu> Thu, 01 July 2010 05:05 UTC

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Date: Thu, 1 Jul 2010 01:05:59 -0400
From: Shumon Huque <shuque@isc.upenn.edu>
To: Martin Rex <mrex@sap.com>
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Subject: Re: [certid] What DNS-ID if also using a DNS-SRV?
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On Wed, Jun 30, 2010 at 05:51:58PM +0200, Martin Rex wrote:
> 
> While CN-ID and DNS-ID have exactly the same scope (hostname)
> SRV-ID and URI-ID have a more restrictive scope.  Does a combination
> make sense?  Or do we expect that to happen only during migration
> from a currently used CN-ID or DNS-ID to a SRV-ID or URI-ID?
> Keep in mind that "flag days" where the _entire_ installed base is taken down,
> changed/updated and put back up, are difficult and rare in practice.

My take is the combination makes sense primarily for migration
periods (which might be long in some cases).

> Should CN-ID or DNS-ID be entirely ignored when SRV-ID or URI-ID is
> found and understood/used by a client for server endpoint identification?
> in the sense that SRV-ID and URI-ID supersede CN-ID or DNS-ID for the
> clients which understand them?

Yes, I think so. I think the draft already specifies a preference
order putting SRV-ID and URI-ID ahead of the DNS-ID/CN-ID.

--Shumon.

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