On Wed, 2007-01-10 at 14:56 +0100, Jan Karjalainen wrote:
> Lennart Börjeson wrote:
> > onsdag 10 januari 2007 14:36 skrev Jan Karjalainen:
> >   
> >> Carlos E. R. wrote:
> >>     
> >>> AFAIK, mac addresses are persistent, they don't change on reboots.
> >>>
> >>>       
> >> So if I run "ifconfig eth0 down hw ether 01:02:03:04:05:06 && eth0 up"
> >> it remembers this after a reboot?
> >> Won´t work on my machine (openSUSE 10.2)...
> >>
> >>     
> >
> > No, it means they never change at all... :-)
> >
> > As some other poster noted, it is by no means sure that your particular 
> > interface can change its mac address at all. By design, mac addresses are 
> > intended to by fixed, unique, and permanent.
> >
> > Some cards have the ability to change its mac address or to accept a 
> > second, "soft", mac address settable at run-time. YMMV.
> >
> >   
> Just to make it clear: my nic supports the changing of mac address.
> Running "ifconfig eth0 down hw ether 01:02:03:04:05:06 && eth0 up" 
> manually does work.

This does _not_ change the embedded MAC address as it _cannot_ be
permanently changed. This is so there never is a duplicate on the WWW.
What you are doing is masquerading the address during your boot session.

-- 
Ken Schneider
UNIX  since 1989, linux since 1994, SuSE  since 1998

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