[Dibbler] Content of duid

Karl Auer kauer at biplane.com.au
Wed Jun 27 03:23:44 CEST 2012

On Tue, 2012-06-26 at 17:05 +0100, Simon Hobson wrote:
> real world the MAC address is no worse (and potentially better, less 
> volatile, commonly available before a system is connected and turned 
> on) than most DUIDs

Less volatile in that it stays the same as long a the NIC doesn't change
and no-one changes the MAC manually, which is entirely possible on some
equipment. On the other hand the MAC address is more volatile in that if
you swap the NIC out, the MAC address changes (a DUID doesn't). And with
MAC addresses, you have to deal with multiple identities for one machine
if the machine has multiple NICS.

It seems obvious to me that as IPv6 gains traction, people buying
pre-installed operating systems will find a DUID printed on the box or
on the underside of the machine, just as MAC addresses now commonly are.

Also, it is part of the standard that the DUID must be settable by the
administrator of a system, so you could pre-allocate your DUIDs (which
you definitely cannot do with MAC addresses).

I'm sure none of this is new to anyone here.
Regards, K.
Karl Auer (kauer at biplane.com.au)

GPG fingerprint: AE1D 4868 6420 AD9A A698 5251 1699 7B78 4EEE 6017
Old fingerprint: DA41 51B1 1481 16E1 F7E2 B2E9 3007 14ED 5736 F687

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