Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Address

James,

4291:
   For all unicast addresses, except those that start with the binary
   value 000, Interface IDs are required to be 64 bits long and to be
   constructed in Modified EUI-64 format.

4291bis:
   IPv6 unicast routing is based on prefixes of any valid length up to
   128 [BCP198].  For example, [RFC6164] standardises 127 bit prefixes
   on inter-router point-to-point links.  However, the Interface ID of
   all unicast addresses, except those that start with the binary value
   000, is required to be 64 bits long.  The rationale for the 64 bit
   boundary in IPv6 addresses can be found in [RFC7421]

Proposal:
   IPv6 unicast routing is based on prefixes of any valid length up to
  128 bits [BCP198]. However, as explained in [RFC7421], the Interface ID
   of unicast addresses is generally required to be 64 bits in length, with
   exceptions only provided in special cases where expressly recognised
   in IETF standards track documents.

I think that's a good proposal.
Perhaps with s/is generally required to be/are/

Best regards,
Ole

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