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This is an old revision of this page, as edited by Chris uvic (talk | contribs) at 18:20, 30 June 2021 (→‎When Microsoft started using UUIDs: new section). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

MAC and clock - bad ideas?

It is common to copy MAC addresses over from one NIC to another in clustered environments. So make sure to use the factory MAC and not the MAC visible on the network.

The clock may generate (improbable) duplicates if it is set backwards. I already had to adjust the clock of a server backwards, probably due to a HW glitch. A rogue NTP server might be used as an attack vector.

Version 1 and 2 also have poor entropy. This is not necessarily a disadvantage. A more or less sequential nature of UUIDs may be a wanted feature [1].

The clock has the advantage to allow to reconstitute roughly in which order the UUIDs have been generated - if you can trust the clock.

BTW, version 6 is on the way: [2]

Stonux (talk) 14:11, 10 July 2020 (UTC)[reply]

References

  1. ^ https://www.2ndquadrant.com/en/blog/sequential-uuid-generators/
  2. ^ https://tools.ietf.org/html/draft-peabody-dispatch-new-uuid-format-00

UUID generator: why only uuidgen.org allowed?

While this generator is recommended by ITU-T, I don't see uuidgen.org being recommended by any authorities (ITU-T, ISO, IETF). Only thing in that website is "@Accelery", which is a twitter account with only one tweet: "Online UUID generators seem stuck in the past, so we made a new one." That's it, no more information is given. Very flimsy. How can we trust that? How superior is that from the one recommended by ITU-T? Any users of that tool can comment? There was a comment <!--Do not add any more GUID generator web sites; they will be removed. which discouraged editors to add alternative UUID generators. That's advertising, in my opinion. Therefore I removed it and replaced by the ITU-T one. Feelthhis (talk) 04:00, 19 December 2020 (UTC)[reply]

DOCTYPE Puzzle

Readers of this page may be interested in thw following discussion:

--Guy Macon (talk) 22:37, 1 June 2021 (UTC)[reply]

When Microsoft started using UUIDs

To help fill in the history for when Microsoft started using UUIDs (the "when" question is flagged in the article), I have a bit of information that might help someone search for the answer.

I attended a Microsoft conference at the Redmond campus in 1995 where a presenter gave information about UUIDs, how they are essentially unique, and that Microsoft was going to be using them.

That's not enough to put into the article, obviously, but maybe it'll help give a timeline if someone is researching this.

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