[Fedora-xen] virt-manager failure

[Daniel P. Berrange]

On Wed, Sep 05, 2007 at 06:45:51AM -0400, Bryan Kearney wrote:
> I have noticed that the xen-libs drips the vibr0.

Urm, huh ? What are you trying to say here ?

>                                                   If you are using kvm.. it
> is basically busted. I had to create my own bridge and use that explicitly.

This is the desired behaviour - the only reason why Xen provides a xenbr0
is historical baggage. Creating a bridge device out of the box simply does
not work if you are using Wifi, or if your network is not online at boot,
or if you use network manager to switch between devices on the fly, or if 
you are booting off iSCSI or NFS root.

Xen has some hacky heuristics which sort of work if you are lucky enough  to
be booting local disk with a permanent hard wired ethernet device, but these
break horribly just as often as they work. Our intent is to remove the automatic
Xen provided bridge. It is simple to manaully configure a bridge containing
eth0 using the config files in /etc/sysconfig/network-scripts. In addiiton 
libvirt provides virbr0 which is an isolated network device connected to the
outside world using forwarding+NAT.

The two different network config scenarios are described at

http://watzmann.net/blog/index.php/2007/04/27/networking_with_kvm_and_libvirt

Regards,
Dan.
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