Re: Implementation specific Interface-ID

[Aleksi Suhonen <Aleksi.Suhonen at tut.fi>]

Hi,

Sorry for slow response, I had somehow missed your message.

Vijayrajan ranganathan wrote:
>     But regarding the 2nd solution, I am wondering how vmware and xen
> are able to offer a unique MAC address to each virtual OS.
>     I mean, what address space do these come from?

Both Xen and VMware have reserved OUI address space:

00-16-3E   (hex)                Xensource, Inc.

00-05-69   (hex)                VMware, Inc.
00-0C-29   (hex)                VMware, Inc.
00-1C-14   (hex)                VMware, Inc
00-50-56   (hex)                VMware, Inc.

I don't remember which ones they use for what purposes.

>     What happens if they need to host a large number of virtual OSes,
> do they pre-allocate these, any ideas?

The OUI prefixes are 24 bits long, so you can accomodate 16 million 
virtual hosts per OUI. You can also configure some other mac prefix, if 
you run out or you don't want to use a certain prefix...

--
	Aleksi Suhonen