Re: [dhcwg] Iotdir last call review of draft-ietf-dhc-v6only-03

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 25 June 2020 14:18 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: otroan@employees.org
cc: Lorenzo Colitti <lorenzo@google.com>, "Pascal Thubert \(pthubert\)" <pthubert@cisco.com>, "iot-directorate\@ietf.org" <iot-directorate@ietf.org>, "dhcwg\@ietf.org" <dhcwg@ietf.org>, "draft-ietf-dhc-v6only.all\@ietf.org" <draft-ietf-dhc-v6only.all@ietf.org>, "last-call\@ietf.org" <last-call@ietf.org>
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Subject: Re: [dhcwg] Iotdir last call review of draft-ietf-dhc-v6only-03
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otroan@employees.org wrote:
    >> The key point of the option is that host does not need IPv4.
    >> I agree with some commenters that it isn't obvious that it implies that NAT64
    >> is available.  But, we have other signals for that, I think.
    >>
    >> NAT64 puts *no* requirements on the hosts (except that they be willing to
    >> succeed network attachment without IPv4).

    > Apart from forcing all IPv6 applications to be compliant with the NAT "architecture".

When you say NAT "architecture", you are thinking, I guess of:
    - no IP address literals in protocol
    - no call-back patterns, like FTP, SIP,
    - UDP or TCP only

But, I don't think that's true.

Yes, it requires all IPv4-only end points (servers, etc.) to be compliant with the
NAT "architecture", but they already have to do that.
I think that IPv6-only applications are free to do anything they want.

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