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Re: [dnssd] Last Call: <draft-ietf-dnssd-requirements-04.txt> (Requirements for Scalable DNS-SD/mDNS Extensions) to Informational RFC

David Farmer <farmer@umn.edu> Wed, 04 March 2015 01:28 UTC

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Date: Tue, 03 Mar 2015 19:28:13 -0600
From: David Farmer <farmer@umn.edu>
Organization: University of Minnesota
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To: Stuart Cheshire <cheshire@apple.com>
Subject: Re: [dnssd] Last Call: <draft-ietf-dnssd-requirements-04.txt> (Requirements for Scalable DNS-SD/mDNS Extensions) to Informational RFC
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On 3/3/15 19:08 , Stuart Cheshire wrote:
> On 3 Mar, 2015, at 17:03, David Farmer <farmer@umn.edu> wrote:
>
>> The original wording at least implied some level of interoperability, I'm not sure "leverage and build upon" does that.  It sound more like code reuse is important rather than interoperability.
>>
>>     REQ5:   SSD should inter-operate with current link scope
>>             DNS-SD/mDNS protocols and deployments to the extent
>>             practicable.
>>
>> I think my answer to the question is bidirectional would be the best case.  But, remember these are competing requirements to be balanced. So, in the worst case ships-in-the-night meets REQ5 and REQ6.
>
> No, it’s more device reuse than code reuse. You shouldn’t have to buy a new printer to use it with SSD. Or new network cameras, home thermostats, etc.

Agreed.

> No it’s not a bidirectional requirement. It’s unidirectional:
>
> A modern client needs to be able to discover a ten-year-old printer even when it’s remote.
>
> The ten-year-old printer doesn’t need to discover anything new.
>
> Stuart Cheshire

If possible I'd like both an old client to discover a new printer, as 
well as a new client to discover an old printer.  That was my 
interpretation of bidirectional.



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David Farmer               Email: farmer@umn.edu
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