On 10/19/2009 03:18 AM, Daniel Berteaud wrote: > Le lundi 19 octobre 2009 à 09:14 +0200, Chris Lalancette a écrit : >> Sascha Frey wrote: >>> Hi, >>> >>> I met a problem setting up virt-manager and libvirt: >>> >>> I want to use an existing customized network bridge with libvirt >>> (I need special iptables rules and a custom DHCP setup). >>> >>> So I created a network definition file like this: >>> <network> >>> <name>NAT</name> >>> <bridge name='br-nat' /> >>> </network> >>> >>> Unfortunately, I'm unable to activate this network, because libvirt >>> tries to create the bridge `br-nat' and fails, because it already >>> exists: >>> >>> # virsh net-start NAT >>> error: Failed to start network NAT >>> error: cannot create bridge 'br-nat': File exists >>> >>> >>> I just want libvirt to attach the guest's tap devices to this existing >>> bridge. I don't want libvirt to manage the network. >>> >>> Is there any chance to realize this set-up? >>> It should work with virt-manager using the graphical wizard. >> >> Yes, just don't define a new network. To use existing bridges, you just need to >> edit your guest XML files to use something like: >> >> <interface type='bridge'> >> <mac address='00:16:3e:4a:f6:89'/> >> <source bridge='br0'/> >> </interface> >> >> Note that configured bridges should also show up in virt-manager, I believe. > > Existing bridge shows up in virt-manager when run on the local machine. > If you use a remote connection (at least qemu+ssh), you don't see it, > you need to manually edit the guest XML. > > (btw, is this a known "problem" or a bug ?) > For a while, libvirt didn't support a way to enumerate bridge devices on a remote machine. That support now exists, but virt-manager needs to be updated to use it (nontrivial). Known issue. - Cole -- Libvir-list mailing list Libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list