Re: [Xen-devel] [PATCH]: xl: use libuuid to generate random UUID's

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

 On 08/10/2010 03:44 AM, Ian Campbell wrote:
> On Thu, 2010-08-05 at 03:27 +0100, Jeremy Fitzhardinge wrote:
> > On 08/04/2010 07:19 PM, Ian Pratt wrote:
> > > The best approach is to generate locally administered MAC addresses
> > hence giving us 46 bits of freedom rather than XenSource registered
> > OUI addresses which have just 24 bits -- collisions will be *much*
> > less likely. Further, it's best not to generate random addresses every
> > time, but to derive the MAC address from a good hash of the VM UUID
> > and the NIC number so that they are deterministic.
> >
> > Yes!  I've been doing that manually (where my hash is '+'), but its
> > irritating to keep doing over and over.
> Where I care about a stable MAC I use
>         vif = [ 'mac=xx:xx:xx:xx:xx:xx' ]
> in my domain config file. AFAICT that is the only 100% reliable way to
> get a stable MAC address since the other schemes all have some corner
> case or other...
I always manually set a uuid in the domain (well, uuid-gen), and I'd 
like the mac to be derived from that.
    J

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