I've an xp virtual machine on qemu/kvm, F11. I'd like to be able reach it over the network - for instance with NX. To do that, I'm trying to set up bridged networking. The howto at http://wiki.libvirt.org/page/Networking says:
As of time of writing (Fedora 9) NetworkManager does not support bridging, so it is necessary to disable it, and revert to "classic" network initscripts
Still true? If not, how do you set up bridging on NM?
A howto on setting up kvm networking on F9 (http://www.linux-kvm.com/content/using-bridged-networking-virt-manager) and the ubuntu howto's talk about creating a tap interface. The libvirt.org doesn't. Is a tap interface required/useful?
Do I need a physical network card for each bridged vm? Is this what the tap interface is for?
And finally where does the kvm driver disk ( NETKVM-20081229.iso ) fit in all this? Do I need to install it in the xp vm before I ...??
sean
sean darcy wrote:
Initial info: all answers refer to KVM, GNOME, and no VMM. YMMV.
I've an xp virtual machine on qemu/kvm, F11. I'd like to be able reach it over the network - for instance with NX. To do that, I'm trying to set up bridged networking. The howto at http://wiki.libvirt.org/page/Networking says:
As of time of writing (Fedora 9) NetworkManager does not support bridging, so it is necessary to disable it, and revert to "classic" network initscripts
Still true? If not, how do you set up bridging on NM?
A small script can do it for you and will not interfere with NM operation (AFAIK - works for me). Attach the NIC to the bridge.
A howto on setting up kvm networking on F9 (http://www.linux-kvm.com/content/using-bridged-networking-virt-manager) and the ubuntu howto's talk about creating a tap interface. The libvirt.org doesn't. Is a tap interface required/useful?
If the VM is a /client/ and originates all connections, you don't need tap, and the outgoing IP will be the host, doing masquerade.
Do I need a physical network card for each bridged vm? Is this what the tap interface is for?
Not that I can see, I have three servers and several test machines on a single bridge and it works fine.
And finally where does the kvm driver disk ( NETKVM-20081229.iso ) fit in all this? Do I need to install it in the xp vm before I ...??
Also: I have done this on FC{6,9,10} but not FC11 yet, I simply don't have an extra machine with hardware VM which I can use at the moment. I lack the courage or need to try KVM under KVM.
On Tue, Apr 28, 2009 at 06:48:18PM -0400, sean darcy wrote:
I've an xp virtual machine on qemu/kvm, F11. I'd like to be able reach it over the network - for instance with NX. To do that, I'm trying to set up bridged networking. The howto at http://wiki.libvirt.org/page/Networking says:
As of time of writing (Fedora 9) NetworkManager does not support bridging, so it is necessary to disable it, and revert to "classic" network initscripts
Still true? If not, how do you set up bridging on NM?
NetworkManager does not support bridging, but it is not technically neccessary to disable NM completely. You merely need to disable it for the particular network cards you wish to bridge. You can do this by creating an ifcfg-XXX file for the NIC in question and adding the lkine
NM_CONTROLLED=no
and then networkmanager will ignore that.
A howto on setting up kvm networking on F9 (http://www.linux-kvm.com/content/using-bridged-networking-virt-manager) and the ubuntu howto's talk about creating a tap interface. The libvirt.org doesn't. Is a tap interface required/useful?
Do I need a physical network card for each bridged vm? Is this what the tap interface is for?
You should never have to worry about tap devices at all. libvirt takes care of all tap device creation. The only manual config you should ever need todo is to configure a bridge device as per that wiki page above.
In Fedora 12, we will hopefully be able to do this from virt-manager too
Daniel
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sean darcy