[libvirt] macvtap not working on kvm

[Amit Tewari]

Hi all,

In same previous scenario of macvtap ,Im not able to assign dhcp address
to guest interface, and if I assign static ip of my lan to guest
interface , than also it is not able to connect to the network..

 

________________________________

From: libvir-list-bounces at redhat.com
[mailto:libvir-list-bounces at redhat.com] On Behalf Of Amit Tewari
Sent: Tuesday, December 13, 2011 5:11 PM
To: xhu
Cc: libvir-list at redhat.com
Subject: Re: [libvirt] macvtap not working on kvm

 

Hi,

Actually udev renames the eth0 interface in guest to eth1 because
macvtap0 has different mac address then eth0 on host.. 

Is there some way so that we can prevent changing this rename of eth0 to
eth1 on guest. I don't want to change udev files.

 

________________________________

From: xhu [mailto:xhu at redhat.com] 
Sent: Tuesday, December 13, 2011 3:01 PM
To: Amit Tewari
Cc: libvir-list at redhat.com
Subject: Re: [libvirt] macvtap not working on kvm

 

On 12/13/2011 12:59 PM, Amit Tewari wrote: 

Hi all,

 

My test environment

Host os=rhel6.1

Guest os = rhel6.1

Libvirt=0.9.8

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 at 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

 

It gives following message

"Bringing up interface eth0:  Device eth0 does not seem to be present,
delaying initialization.

[FAILED]"

The interface name may change to ethN(N may be 1 or 2 ...) due to the
change of guest interface mac address.
You can log in guest and use command: "ip  link show" to get the value
of N.
Then create ifcfg-ethN for it and use "ifup ethN" to start it in guest.

 

Guest eth interface does not create. What is the problem?

 

When I checked dmesg on host it gives following message-"macvatp0: ipv6
routers not present"

 

Please let me know how macvtap work on kvm.

 

 
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