On Weds 12th December, Remi Despres wrote, in part:
> Not sure however that the two proposed questions
> are clear enough because today:
> - some IIDs have u = 0, and some have u = 1,
> - some IIDs have g = 0, and some have g = 1.
> The only combination that isn't used is u=g=1.
While U==G==1 is not *widely deployed* today,
it does have a very clear definition, namely:
(U==1 && G==1) defines a global-scope
multicast identifier.
This is clear not only from a plain-language
reading of RFC-4291, Section 2.5.1, but also
from the IEEE 802 definition of an EUI-64.
Further, an IID formed by algorithmically translating
an IEEE 802 MAC Address (e.g. using RFC-4291,
Appendix A), whether using a unicast or multicast
MAC address, is a widely deployed example of an
"interface identifier with universal scope".
Yours,
Ran
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