At Mon, 20 May 2013 10:18:21 -0400, John C. Klensin wrote:
This is not my primary (or even secondary) area of expertise
but, given that the RR space is not unlimited even though it is
large, wouldn't it be better to have a single RRtype for
IEEE-based EUIs with a flag or other indicator in the DATA field
as to whether a 48 bit or 64 bit identifier was present?
Short answer: Probably not, but it depends on the application.
Longer answer: See RFC 5507.