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Re: [Xen-users] changing MAC address makes VM unreachable

from [Tim Freeman]

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Subject:	Re: [Xen-users] changing MAC address makes VM unreachable
From:	Tim Freeman <tfreeman@xxxxxxxxxxx>
Date:	Mon, 7 Aug 2006 12:05:11 -0500
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On Mon, 31 Jul 2006 23:24:52 -0500
Tim Freeman <tfreeman@xxxxxxxxxxx> wrote:

> I'm using 3.0.2-3 and have gotten a matching user report from someone using
> 3.0.1.  
> 
> After powering off a VM, changing its MAC address and rebooting, it becomes
> unreachable.  

Solved this, the random MACs being generated (by non-Xen software) in the
non-working case were not unicast.

As outlined here: 

http://wiki.xensource.com/xenwiki/XenNetworking

"Ensure you choose a unicast address.  That is, one with the low bit of the
first octet set to zero. For example, an address starting aa: is OK but ab: is
not. It is best to keep to the range of addresses declared to be "locally
assigned" (rather than allocated globally to hardware vendors). These have the
second lowest bit set to one in the first octet. For example, aa: is OK, a8:
isn't."

Tim 

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