WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

RE: [Xen-users] uniq mac address generator

To: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Subject: RE: [Xen-users] uniq mac address generator
From: Timo Benk <timo.benk@xxxxxx>
Date: Fri, 13 Apr 2007 16:00:08 +0200
Cc: trilok nuwal <tc.nuwal@xxxxxxxxx>, Xen list <Xen-users@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Fri, 13 Apr 2007 07:00:27 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <907625E08839C4409CE5768403633E0B018E1BD4@xxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <907625E08839C4409CE5768403633E0B018E1BD4@xxxxxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: RoundCube Webmail/0.1b
On Fri, 13 Apr 2007 15:40:45 +0200, "Petersson, Mats" <Mats.Petersson@xxxxxxx> 
wrote:
>  
> 
>> -----Original Message-----
>> From: Timo Benk [mailto:timo.benk@xxxxxx] 
>> Sent: 13 April 2007 14:34
>> To: trilok nuwal
>> Cc: Petersson, Mats; Xen list
>> Subject: Re: [Xen-users] uniq mac address generator
>> 
>> Hi,
>> 
>> > But How i can insure that mac geneareted by this script will
>> > be uniq in whole world. Some body in the same network also
>> > might use the same script
>> > and can get the same  mac as i am .
>> 
>> You can add a little python to your config files. That way
>> you can bind the MAC to the vmid parameter. The vmid
>> code is directly extracted off the example configuration.
> 
> But that's CERTAINLY doesn't make it unique, unless you also make sure
> the rest of the numbers that make up the MAC address are unique to the
> world. I also think you need to restrict your VMID to 0..255 in some
> way, such as "and 255" or "modulo 256". [Don't know for sure how you do
> that in Python].  

Well, i don't think that the intention of the original author was to ensure
worldwide uniqueness.

But with the skript you can ensure unique MAC-Adresses inside you network.

By changeing the prefix you can run multiple Domain-0s, each with a uniq
MAC-Adress space.

I don't see any advantage in generating word-wide unique MAC-Adress, however.

Greetings,
-timo
-- 
Timo Benk - Jabber ID: fry@xxxxxxxxxxxx - ICQ ID: #414944731
PGP Public Key: http://www.m28s01.vlinux.de/timo_benk_gpg_key.asc



_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users