I have a virtual machine running under qemu-kvm, on a 13.10 host. I am using virt-manager to define the machine, and I have added a virtual NIC, using the new macvtap driver. I have the following definition:
<interface type='direct'> <mac address='52:54:00:1f:dd:c4'/> <source dev='eth0' mode='bridge'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface>
On the host machine, I can see that the tap interface is created:
$ip link 5: macvtap0@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT qlen 500 link/ether 52:54:00:1f:dd:c4 brd ff:ff:ff:ff:ff:ff $ls /dev/tap5 /dev/tap5
But in the virtual machine, interface eth0 is unable to access the network. dhcp fails. Static configuration obviously works, but then I cannot ping anything.
I have no iptables rules, neither on the host, nor in the virtual machine.
So, how can I troubleshoot this problem ?