RE: [Xen-users] uniq mac address generator

[Timo Benk <timo.benk@xxxxxx>]

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



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