Re: [libvirt] macvtap nt working on kvm
Hi,
Actually macvatap doesn't work with bridge. So once the physical device
is attached to a bridge, a macvtap attached to that device no longer
works.
In my case there is no bridge on the interface. but still guest os is
not able to get ip address.
Is there no support for macvtap on red hat 6.1 x_86 platforms?
-----Original Message-----
From: libvir-list-bounces(a)redhat.com
[mailto:libvir-list-bounces@redhat.com] On Behalf Of Laine Stump
Sent: Thursday, December 15, 2011 2:31 AM
To: libvir-list(a)redhat.com
Subject: Re: [libvirt] macvtap nt working on kvm
On 12/14/2011 02:26 PM, Stefan Berger wrote:
On 12/14/2011 07:40 AM, Amit Tewari wrote:
>
> Hi all,
>
> My test environment
>
> Host os=rhel6.1
>
> Guest os = rhel6.1
>
> Libvirt=0.8.7
>
> Kvm hypervisor
>
> I have made this entry in guest xml file
>
> <interface type='direct'>
>
> <source dev='eth0' mode='bridge'/>
>
> <model type='virtio'/>
>
> <address type='pci' domain='0x0000' bus='0x00'
slot='0x03'
> function='0x0'/>
>
> </interface>
>
> Now when I start the guest
>
> *#virsh start guest*
>
> Following macvtap0 is created on host and is shown below
>
> #*ip link show macvtap0*
>
> 51: macvtap0@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
> mq state UNKNOWN qlen 500
>
> link/ether 52:54:00:55:AE:B5brd ff:ff:ff:ff:ff:ff
>
> but when the guest is up and I try to perform
>
> **
>
> *# ifup eth0*
>
> *eth0 has same mac address as that of macvatap0 that is
> 52:54:00:55:AE:B5*
>
> **
>
> *due to this guest is not able to get dhcp address nor static ip
> address is working*.
>
> Please let me know how macvtap work on kvm.
>
I have tried your setup on my machine with the following host
configuration:
# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.001a64d00016 no eth0
virbr0 8000.000000000000 yes
If I use the configuration as you have shown it doesn't work for me,
either. However, if I use
<source dev='br0' mode='bridge'/>
then it works as expected. Do you happen to have a similar
configuration on the host with the interface the macvtap device wants
to use as 'source' being bridged?
Interesting. So you're saying that once the physical device is attached
to a bridge, a macvtap attached to that device no longer works? That's
useful to know :-)
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