To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: virtual interface mac adress
Date: Sun, 4 Dec 2005 12:41:22 -0800 (PST)
Organization: Mostly alphabetical, except Q, with we do not fancy
Message-ID: <dmvk9i$631$1@terminus.zytor.com>
References: <20051204192958.64093.qmail@web60214.mail.yahoo.com> <Pine.LNX.4.63.0512041520320.29211@cuia.boston.redhat.com>
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Followup to:  <Pine.LNX.4.63.0512041520320.29211@cuia.boston.redhat.com>
By author:    Rik van Riel <riel@redhat.com>
In newsgroup: linux.dev.kernel
>
> On Sun, 4 Dec 2005, anil dahiya wrote:
> 
> > I want to assign mac addres to virtual adpater and mac
> > address should be like that if it should not create
> > problem in arp resoultion(i.e. mac address should be
> > as real card which able to comunicate  on lan )
> 
> You may be able to get away with using a MAC address
> inside the OUI range that XenSource registered.
> 

Any MAC with bit 0 clear and bit 1 set in the first octet is "local
use"; the best thing to do (unless you have your own OUI) is just to
pick a random address inside this range.  You should only run into
collision problems when you get close to 2^23 hosts on a network.

	-hpa
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