To use the relatively new macvtap bridge network interfaces in KVM, the host network interface must be set to promiscuous mode.
Edit /etc/network/interfaces with nano or something and add the up and down lines.
For example...iface eth0 inet staticup ifconfig $IFACE promisc######## YOUR INTERFACE CONFIG HERE#######down ifconfig $IFACE -promisc
Reboot and check if promiscuous mode is enabled: ifconfig and see if the PROMISC flag is set on the interface.
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