RE: [Xen-users] windows XP Guest network doesn't work

["David Morris" <david.morris@xxxxxxxxxx>]

Martin, good eyes! I've been making up MACs for Xen installations for more than 
2 years and foolishly, it never occurred to me to learn anything about MAC 
address architecture.

I changed the first byte to 40 and it now appears to work.

Thanks for your help

  Dave Morris

> -----Original Message-----
> From: Martin Goldstone [mailto:m.j.goldstone@xxxxxxxxxxxxxxx]
> Sent: Thursday, August 30, 2007 2:11 AM
> 
> The MAC address for the Windows guest seems odd.  The Xen 
> Wiki recommends:
> 
> - ---
> 
> Virtualized network interfaces in domains are given Ethernet MAC
> addresses. By default xend will select a random address, this will
> differ between instantiations of the domain. If it is 
> required to have a
> fixed MAC address for a domain (e.g. for using with DHCP) 
> then this can
> be configured using the mac= option to the vif configuration directive
> (e.g. vif = ['mac=aa:00:00:00:00:11']).
> 
> When choosing MAC addresses to use, 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.
> 
> In summary, an address of the following form should be OK:
> 
> XY:XX:XX:XX:XX:XX
> 
> where X is any hexadecimal digit, and Y is one of 2, 6, A or E.
> 
> - ---
> (The full article is here: 
> http://wiki.xensource.com/xenwiki/XenNetworking)
> 
> Your MAC starts with 11 - 00010001 in binary, which makes it 
> a multicast
> address (I think). Starting it with 12 would give 00010010, which I
> think should be fine.  The MAC on the RH guest starts 00, 
> which is also
> unicast, but I don't think its defined as a locally administered MAC.
> 
> So far, that's the only thing I've noticed that could be problem.
> 
> I'd suggest trying changing the MAC and seeing if that has any effect.
> 
> Martin
> 
> 
> 
> David Morris wrote:
> > Thanks for the followup ... the domUs were initially 
> created using virt-manager which gave me workable config 
> files for this Xen version. I then tweaked the files as 
> needed and use xm to manipulate the VMs.
> > 
> > It appears the Xen is emulating a RealTek ethernet adapter, 
> so I downloaded the latest drivers for the 8139 device and 
> created an iso which you will note as the current CD. 
> Unfortunately, windows couldn't correlate any of the devices 
> in the cd image with its view of the adapter. I forced the 
> install and the adapter didn't come up. I reverted the driver. 
> > 
> > Attachments:
> >   infoOutput.txt -- script capture of the xenhost console 
> as I was displaying 
> >                     the configs, xm list outputs, ifconfig, 
> brctl,                        
> >                     and the current route table.
> >   winxpTest      -- config file for the windows guest
> >   dwm3           -- config file for my RHEL5 guest
> >   winxpTestIPCONFIG.gif -- screen capture of ipconfig /all 
> on win guest, also ping and
> >                     tracert output
> >   dwm3PingTracert.gif   -- screen capture of ping test on 
> the RH guest to show that
> >                     the basic environment routes to the ping target.
> > 
> > Dave Morris  
> > 
> > 
> >> -----Original Message-----
> >> From: Martin Goldstone [mailto:m.j.goldstone@xxxxxxxxxxxxxxx]
> >> Sent: Wednesday, August 29, 2007 1:07 AM
> >>
> >> Are you creating the VMs through virt-install/virt-manager or 
> >> using xm?
> >>
> >> Either way, can you post the config for the XP guest 
> (either the file
> >> used with xm or the output from 'virsh dumpxml <domID>')?
> >>
> >> Also, can you post the output from ifconfig and brctl show?
> >>
> >> Martin
> >>
> >> David Morris wrote:
> >>> I have Xen 3.0.3 installed on RH EL5 via RedHat RPMs. 
> >>>
> >>> I have a Win/XP Pro HVM and a Linux rh5 HVM. I can create 
> >> both w/o a problem and
> >>> can interact with the VNC based console for both VMs.
> >>>
> >>> The Linux VM interacts via DHCP, obtains an IP and seems to 
> >> work fine on the network.
> >>> The Win/XP VM doesn't work with either DHCP or a static IP 
> >> address assignment.
> >>> I can see the virtual interfaces with 'brctl show' and 
> >> don't recognize a difference.
> >>> The hardware devices dialog on WinXP shows the network in 
> the green.
> >>>
> >>> What am I missing here?
 

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