Hi, Thanks all for your help, I installed libvirt 0.6.0-4 and kvm 84-1 from fedora's rawhide and that solved the problem. However know I have a new problem I tried the other virtual machines and some of them just don't start, they seem to stop when the bios jumps to the disk and grub, any ideas? The only thing I can think of is to upgrade the host kernel but if I'm not wrong I have to upgrade to Fedora 9 or 10, and I would like to try something else before because I want to have everything running before leaving xen completely

Subject: RE: [libvirt] Help with bridged networking From: lutter@redhat.com To: observer1@hotmail.es Date: Fri, 27 Feb 2009 08:48:13 -0800

On Fri, 2009-02-27 at 00:55 +0000, Jesus Urroa wrote:

...

My mistake I see the lines for the ip config commented out in the file and I place them again Anyway I remove the card from the bridge to simplify the problem a little, this the output of brctl show for the bridge using only xen (no libvirt at all) and using kvm with libvirt and running only 2 vms:

worknet 8000.feffffffffff no vif1.0 vif4.0 vif5.0 vif6.1 vif7.1 vif8.0

worknet 8000.00ff52959073 no vnet0

vnet3

With the non-Xen setup, your bridge should have the same IP address as the enslaved NIC.

What exactly is not working ? Can VM's on the same bridge ping each other ?

Did you add teh following iptables rule (to forward packages from the bridge to the outside):

# echo "-I FORWARD -m physdev --physdev-is-bridged -j ACCEPT" > /etc/sysconfig/iptables-forward-bridged # lokkit --custom-rules=ipv4:filter:/etc/sysconfig/iptables-forward-bridged # service libvirtd reload

Otherwise, your VM;s can't talk to the outside.

David

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