On 02/04/2016 01:07 PM, Niccolò Belli wrote:
Ok, I understand it.
I manually create a tap device and I added it to my bridge, can you
please at least tell me how am I supposed to use it with virt-manager?
With plain qemu I simply use -net nic,model=virtio -net
tap,ifname=tap0,script=no,downscript=no,vhost=on but I didn't find how
to use tap0 with the virt-manager graphical interface.
Ah, I think you've misunderstood the use of the virt-manager command to
create a bridge. That command uses netcf (where available) to create a
bridge device that is attached to a physical ethernet on the host. You
only do that once.
If you already have a bridge setup on your host, for each guest you just
add an interface in the normal manner (NB: you do not create any tap
devices; libvirt does that for you and connects them to the proper
place), and tell it to connect to the bridge device that was already
created. If your bridge doesn't show up in the list provided by
virt-manager (which would likely happen if your libvirt was built with
netcf support on a distro that has a non-functioning netcf), then just
select "Specify shared device name" at the bottom of the list of network
sources, then type in the bridge's name yourself. (you could eliminate
this problem by rebuilding libvirt to use the "udev" backend to the
interface driver rather than the "netcf" backend, but if I were in your
position I wouldn't bother with that - too much potential to break
something else).
Alternately, once you have the host bridge created on your host (for
example's sake let's say it is named "br0") you can create a libvirt
network that references this existing bridge like this:
1) create a temporary text file (name it anything you like, e.g.
xyzzy.xml) with the following contents:
<network>
<name>bridge-net</name>
<bridge name='br0'/>
<forward mode='bridge'/>
</network>
2) as root, run the following commands:
# virsh net-define xyzzy.xml
# virsh net-autostart bridge-net
# virsh net-start bridge-net
Now when you select the "network source" for a guest's interface in
virt-manager, one of the selections will be:
Virtual network "bridge-br0"
That's the one you should use.
At this point your problems are really in the realm of libvirt rather
than netcf, so it might be more useful if you sent further questions to
"libvirt-us...@redhat.com" rather than the netcf list. Alternately, if
you use IRC, connect to irc.oftc.net and ask in #virt, which is
frequented by nearly all the libvirt developers, as well as quite a few
kvm/qemu people.
You may also want to read the libvirt wiki page on networking:
http://wiki.libvirt.org/page/Networking
_______________________________________________
netcf-devel mailing list
netcf-devel@lists.fedorahosted.org
https://lists.fedorahosted.org/admin/lists/netcf-devel@lists.fedorahosted.org
