[libvirt-users] F20 Virt-Manager with MacVTap not working

[Laine Stump]

(Please put your responses inline rather than top-posting)



On 02/12/2014 10:07 AM, John Obaterspok wrote:

>     Hello,
>     I've setup a VM with default networking (NAT) and this works fine
>     but hosts on my LAN can't get to the VM since it uses NAT.
>
>     When I try to set network to use MacVTap with either default or
>     bridged I get no networking for the VM. 
>     Any hints around this? I would like to have the VM's on the same
>     LAN as my host and other machines. I don't care if the VM host
>     can't reach the guests.
>
>     It did work find in F19 but there I believe I had more MacVtap
>     devices to choose from.

    2014-02-12 11:41 GMT+01:00 Laine Stump <laine at laine.org
    <mailto:laine at laine.org>>:

    I am using macvtap on F20 with no problems. Which device are you
    selecting to connect the macvtap device to? You should use the
    physical device that your host uses for network communication.
    Please send the <interface> section of the output of "virsh
    $guestname dumpxml" (where $guestname is, of course, the name of the
    guest with non-working networking).



On 02/12/2014 03:16 PM, John Obaterspok wrote:
> The guest was setup through virt-manager. The machine is not
> configured much after a F20 install (I believe I didn't change any
> network things)
>
>  Here is the network part:
>
>    <interface type='direct'>
>       <mac address='52:54:00:fe:b0:66'/>
>       <source dev='em1' mode='bridge'/>
>       <target dev='macvtap0'/>
>       <model type='virtio'/>
>       <alias name='net0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
>     </interface>

It seems you are not alone. Here's a new BZ filed just last night:

  https://bugzilla.redhat.com/show_bug.cgi?id=1064516

It's unclear whether the reporter ran wireshark to turn on promiscuous
mode on the host's macvtap interface, the host's physical device, or the
guest's interface to make everything work, but you might try those (you
could just run tcpdump instead of wireshark - same effect).

In the meantime, I notice that the reporter of that BZ is using
qemu-1.6.1-3, while I'm running 1.7.0-4 (which is from the
fedora-virt-preview repo). You might want to try enabling
fedora-virt-preview in your yum setup, updating, then see if the problem
is solved. Otherwise, I guess follow the BZ for progress reports.

  http://fedorapeople.org/groups/virt/virt-preview/fedora-virt-preview.repo


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