[Users] mac address re-use

[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. 

----- Original Message -----

> 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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