[libvirt] macvtap not working on kvm

[xhu]

  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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