9:18 a.m.
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Keith summed things quite right as far as I know (I did not know about the =
range allocated to Qumranet)=20
From code perspective - We have a MacPoolManager infrastructure which
holds=
a pool of Mac addresses, and per deletion of VM, the mac address is return=
ed to the pool.=20
----- Original Message -----
From: "Keith Robertson" <kroberts(a)redhat.com>
To: "Jonathan Horne" <jhorne(a)skopos.us>
Cc: "users" <users(a)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.
=20
> thanks,
=20
> jonathan
=20
> 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
> not operate to bind SKOPOS to any order or other contract unless
> pursuant to explicit written agreement or government initiative
> expressly permitting the use of e-mail for such purpose.
=20
> _______________________________________________
=20
> Users mailing list Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
=20
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,
Keith=D7=9F
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
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<html><head><style type=3D'text/css'>p { margin: 0;
}</style></head><body><=
div style=3D'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 d=
id not know about the range allocated to Qumranet)<div>From code perspectiv=
e - We have a MacPoolManager infrastructure which holds a pool of Mac addre=
sses, and per deletion of VM, the mac address is returned to the pool.</div=
<div><br></div><div><br><br><hr
id=3D"zwchr"><blockquote style=3D"border-l=
eft: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:Helve=
tica,Arial,sans-serif;font-size:12pt;" id=3D"DWT607"><b>From:
</b>"Keith Ro=
bertson" &lt;kroberts(a)redhat.com&gt;<br><b>To:
</b>"Jonathan Horne" <jho=
rne(a)skopos.us&gt;<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>
=20
=20
=20
=20
<div class=3D"moz-cite-prefix">On 01/07/2013 05:22 PM, Jonathan Horne
wrote:<br>
</div>
<blockquote cite=3D"mid:9BE6F493F83A594DA60C45E6A09DC5AC01709931@AUSP01=
DAG0201.collaborationhost.net">
=20
<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 m=
ac
address for each new VM created.</div>
<div><br>
</div>
<div>thanks,</div>
<div>jonathan</div>
<div>
</div>
</div>
</div>
<br>
<hr>
<font color=3D"Gray" face=3D"Arial"
size=3D"1">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 not
operate to bind SKOPOS to any order or other contract unless
pursuant to explicit written agreement or government initiative
expressly permitting the use of e-mail for such purpose.</font>
<br>
<fieldset class=3D"mimeAttachmentHeader"></fieldset>
<br>
<pre>_______________________________________________
Users mailing list
<a class=3D"moz-txt-link-abbreviated"
href=3D"mailto:Users@ovirt.org" targe=
t=3D"_blank">Users(a)ovirt.org</a>
<a class=3D"moz-txt-link-freetext"
href=3D"http://lists.ovirt.org/mailman/l=
istinfo/users"
target=3D"_blank">http://lists.ovirt.org/mailman/listinfo/us=
ers</a>
</pre>
</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>
Keith=D7=9F<br><br><br><br>
<br>
[1]
=20
<a href=3D"http://standards.ieee.org/develop/regauth/oui/public.html" t=
arget=3D"_blank">http://standards.ieee.org/develop/regauth/o...
/a><br>
=20
=20
<br>_______________________________________________<br>Users mailing
list<b=
r>Users@ovirt.org<br>http://lists.ovirt.org/mailman/listinfo/users<br></blo=
ckquote><br></div></div></body></html>
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