Re: [homenet] The minimal Babel profile for Homenet

Michael Richardson <mcr+ietf@sandelman.ca> Wed, 28 October 2015 15:43 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: "STARK\, BARBARA H" <bs7652@att.com>
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Date: Wed, 28 Oct 2015 11:43:19 -0400
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Cc: "homenet@ietf.org" <homenet@ietf.org>, Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
Subject: Re: [homenet] The minimal Babel profile for Homenet
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STARK, BARBARA H <bs7652@att.com> wrote:
    >> (2) SHOULD RFC 6126, IPv4 subset;

    > Why not MUST? Given the massive embedded base (and continued deployment
    > of new) IPv4-only devices, I think the homenet architecture will be
    > less than successful if IPv4 isn't mandatory to implement. It's ok for
    > vendors to ship with IPv4 disabled by default, if that's what the
    > vendor wants to do; but it has to be there.

SHOULD is actually pretty strong.  It doesn't mean, "implement if you like"
(that's MAY).  It means, implement it, unless you have a serious reason why
you can't.

For instance, an IPv6 only IoT gateway probably has no interest in IPv4 if it
can get IPv6.  MUST would make that gateway non-compliant.


--
Michael Richardson <mcr+IETF@sandelman.ca>ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-