SRP: Generating GUIDs/UUIDs

Peter Johansson PJohansson at acm.org
Fri Mar 9 17:18:00 PST 2001


* From the T10 Reflector (t10 at t10.org), posted by:
* Peter Johansson <PJohansson at ACM.org>
*
At 02:22 PM 3/9/01, Simpson, Cris wrote:

>I promised to find the reference for generating GUIDs w/ software: 
>http://www.alternic.org/drafts/drafts-l-m/draft-leach-uuids-guids-01.html

"A UUID is 128 bits long, and if generated according to the one of the 
mechanisms in this document, is either guaranteed to be different from all 
other UUIDs/GUIDs generated until 3400 A.D. or extremely likely to be 
different (depending on the mechanism chosen)."

For the use to which this 128-bit number is to be put, is it of concern 
that they're "...extremely likely to be different"? Sort of puts a 
Clinton-esque spin on the meaning of "unique" ...

It's also too bad it makes no provision for creation of a UUID if you 
happen to have an EUI-64 handy rather than the EUI-48 described (node ID).


Regards,

Peter Johansson

Congruent Software, Inc.
98 Colorado Avenue
Berkeley, CA  94707

(510) 527-3926
(510) 527-3856 FAX

PJohansson at ACM.org

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