All Subnets must be /64, all hosts must use EUI-64? (According to RFC3513)

[Ryan Harden]

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In a conversation with my DNS admin, he brought up the fact that RFC3513
seems to forbid using a subnet size other than /64 AS WELL as using
anything other than EUI-64 to determine the host ID of an address.

In RFC3513: http://www.ietf.org/rfc/rfc3513.txt
Section 2.5.4 Paragraph 2:

"All global unicast addresses other than those that start with binary
   000 have a 64-bit interface ID field (i.e., n + m = 64), formatted as
   described in section 2.5.1.  Global unicast addresses that start with
   binary 000 have no such constraint on the size or structure of the
   interface ID field."

Given 2001::/8 and 2620::/8 fit this criteria, it seems that the
interface ID or HOST portion of an IPv6 address must be 64-bits long and
formatted in accordance to section 2.5.1.

Section 2.5.1 Paragraph 3:
"For all unicast addresses, except those that start with binary value
   000, Interface IDs are required to be 64 bits long and to be
   constructed in Modified EUI-64 format."

The way I read it seems to imply staticly assigned IPv6 addresses are
forbidden. Which puts a damper on securing the coveted DEAD:BEEF address
for my workstation.

I have not understood this to be true and have experienced practice
where this is absolutely not met. I see /126s for p-t-p links, static
DNS servers, static web servers, etc, etc.

Am I reading this wrong? Is this RFC out of date? What is the intent of
these sections in the RFC? At the very least they are unclear and/or
misleading.

RFC3587 Section 3, Paragraph 2 seems to confirm this:
"[ARCH] also requires that all unicast addresses, except those that
   start with binary value 000, have Interface IDs that are 64 bits long
   and to be constructed in Modified EUI-64 format."

/Ryan
- --
Ryan M. Harden, BS, KC9IHX		Office: 217-265-5192
CITES - Network Engineering		Cell:  	630-363-0365
2130 Digital Computer Lab		Fax:    217-244-7089
1304 W. Springfield	 		email:  hardenrm at illinois.edu
Urbana, IL  61801 			

	 University of Illinois at Urbana/Champaign
		University of Illinois - ICCN
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