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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 redhat com]
Sent: Tuesday, December 13, 2011 3:01 PM
To: Amit Tewari
Cc: libvir-list 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 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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