Please check this updated REQ3 in draft-ietf-dmm-requirements-02:
REQ3: IPv6 deployment
DMM solutions SHOULD target IPv6 as the primary deployment
environment and SHOULD NOT be tailored specifically to support
IPv4, in particular in situations where private IPv4 addresses
and/or NATs are used.
Motivation: This requirement is to be inline with the general
orientation of IETF work. DMM deployment is foreseen in mid-
to long-term horizon, when IPv6 is expected to be far more
common than today. It is also unnecessarily complex to solve
this problem for IPv4, as we will not be able to use some of
the IPv6-specific features/tools.
H Anthony Chan
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