[Users] mac address re-use

[Karli Sjöberg]

tis 2013-01-08 klockan 01:18 -0500 skrev Yair Zaslavsky:
Keith summed things quite right as far as I know (I did not know about the range allocated to Qumranet)
From code perspective - We have a MacPoolManager infrastructure which holds a pool of Mac addresses, and per deletion of VM, the mac address is returned to the pool.
Which means that if you set up two oVirt systems independantly; one for production and one for testing, you will get collisions?

/Karli





________________________________

From: "Keith Robertson" <kroberts at redhat.com>
To: "Jonathan Horne" <jhorne at skopos.us>
Cc: "users" <users at ovirt.org>
Sent: Tuesday, January 8, 2013 5:15:04 AM
Subject: Re: [Users] mac address re-use

On 01/07/2013 05:22 PM, Jonathan Horne wrote:

my 3.2 install seems to be reusing mac address of formerly-deleted guests.  is this the normal behavior, and or can i turn this off?  i would prefer to have a unique mac address for each new VM created.


thanks,
jonathan


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I believe re-use is intentional.  I suspect oVirt uses the IEEE [1] space allocated to Qumranet and that space is relatively small.  There were previous discussions on the list regarding the probability of collisions/exhaustion, IIRC.  In any case, you want re-use to prevent the possibility of exhaustion and because a program shouldn't just go randomly creating addresses from any available OUI block.

Cheers,
Keithן




[1] http://standards.ieee.org/develop/regauth/oui/public.html

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