Hi all, My test environment Host os=rhel6.1 Guest os = rhel6.1 Libvirt=0.8.7 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 eth0 has same mac address as that of macvatap0 that is 52:54:00:55:AE:B5 due to this guest is not able to get dhcp address nor static ip address is working. Please let me know how macvtap work on kvm. DISCLAIMER: ----------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. It shall not attach any liability on the originator or NECHCL or its affiliates. Any views or opinions presented in this email are solely those of the author and may not necessarily reflect the opinions of NECHCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of the author of this e-mail is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. . -----------------------------------------------------------------------------------------------------------------------