<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000'>Keith summed things quite right as far as I know (I did not know about the range allocated to Qumranet)<div>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.</div><div><br></div><div><br><br><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" id="DWT607"><b>From: </b>"Keith Robertson" <kroberts@redhat.com><br><b>To: </b>"Jonathan Horne" <jhorne@skopos.us><br><b>Cc: </b>"users" <users@ovirt.org><br><b>Sent: </b>Tuesday, January 8, 2013 5:15:04 AM<br><b>Subject: </b>Re: [Users] mac address re-use<br><br>
<div class="moz-cite-prefix">On 01/07/2013 05:22 PM, Jonathan Horne
wrote:<br>
</div>
<blockquote cite="mid:9BE6F493F83A594DA60C45E6A09DC5AC01709931@AUSP01DAG0201.collaborationhost.net">
<div>
<div>
<div>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.</div>
<div><br>
</div>
<div>thanks,</div>
<div>jonathan</div>
<div>
</div>
</div>
</div>
<br>
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</blockquote>
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.<br>
<br>
Cheers,<br>
Keithן<br><br><br><br>
<br>
[1]
<a href="http://standards.ieee.org/develop/regauth/oui/public.html" target="_blank">http://standards.ieee.org/develop/regauth/oui/public.html</a><br>
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