[Users] mac address re-use

[Yair Zaslavsky]

You can always set a new range of mac addresses using - 

engine-config -g MacPoolRanges (to see the current range) 

and then engine-config -s MacPoolRanges=<new range> 

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

> From: "Karli Sjöberg" <Karli.Sjoberg at slu.se>
> To: "Yair Zaslavsky" <yzaslavs at redhat.com>
> Cc: "Keith Robertson" <kroberts at redhat.com>, "users"
> <users at ovirt.org>
> Sent: Tuesday, January 8, 2013 8:29:49 AM
> Subject: Re: [Users] mac address re-use

> 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
> > > 
> > 
> 
> > > > This is a PRIVATE message. If you are not the intended
> > > > recipient,
> > > > please delete without copying and kindly advise us by e-mail of
> > > > the
> > > > mistake in delivery. NOTE: Regardless of content, this e-mail
> > > > shall
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> > > 
> > 
> 

> > > > _______________________________________________ Users mailing
> > > > list
> > > > Users at ovirt.org http://lists.ovirt.org/mailman/listinfo/users
> > > 
> > 
> 
> > > 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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> 
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