On Tue, Feb 14, 2017 at 11:18 AM, David Farmer <farmer(_at_)umn(_dot_)edu>
wrote:
However, the Interface ID of all unicast addresses is required to be 64
bit with the exception of the following; addresses for point-to-point links
[RFC6164], Network-Specific Prefixes used for IPv4/IPv6 Translators
[RFC6052], and addresses that start with the binary value 000.
I don't think it makes sense to cite RFC6052 here, since in RFC 6052
addresses it's not really possible to define the IID in way that makes
sense. See
https://mailarchive.ietf.org/arch/msg/ipv6/lyZl3I4rXhnmXYFCAQTRWyohfyI .