Instead of a dhcp range being specified, this example has a couple of IPv6 host definitions. Please refer to the documentation of the virtualization system you are using e. Consider your needs when choosing which macvtap mode is right for your environment. A few other common clients are dhcpcd , pump and udhcpc. The other forward modes that use macvtap private, vepa, and passthrough would be used in a similar fashion. So I am trying this with a Debian guest and no matter what mode I set the networking to I can’t seem to get it right. This MAC address is assigned to the bridge device when it is created.

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Using the MacVTap driver

Because a virtual machine runs as an application inside the host computer, connecting it to the outside world needs support from the host operating system.

This happens if the bridge announces itself by sending BPDUs. Note Use of macvtap is arbitrary. If no portgroup is given in the interface definition, and there is no default portgroup, then none will be used. Notify me of follow-up comments by email. This variation of an isolated network defines only IPv6.

It is provided and enabled out-of-the-box for all libvirt installations.

atp VEPA mode, without a network switch thats supports hairpin mode, prevents any endpoints using the same KVM host interface from being able to communicate. Note that the third static route specification includes the metric attribute specification with a value of 2. The optional localPtr attribute since 3. Below is another IPv6 variation. Any IPv4 host element must specify the MAC address of the host to be assigned a given name via the mac attributethe IP to be assigned to that host via the ip attributeand the name itself the name attribute.


Note that the connection is at the data link layer L2 and is thus independent of which network layer protocol is used on top of it. Doubt on Packetflow between Virtual Machine and Host.

Assuming the XML code above was stored in a file named macvtap-def. Use of macvtap is arbitrary.

Network XML format

None of them allow communication with the host. For background information on the concepts referred to here, consult the relevant wiki page.

If you get an error or the lsmod command returns no results, then you may have a problem using the macvlan driver. I believe these settings can be made by issuing an ip route change or replace command, but I am not technologically savvy enough to compose this command.

When a guest interface is being constructed, libvirt will pick an interface from this list to use for the connection. It requires that the IP address range be pre-configured in the routing tables of the router on the host network. This MAC address is assigned to the bridge device when it is created.

The bandwidth element can have at most one inbound and at most one outbound macf element. A valid network definition can contain no IPv4 or IPv6 addresses. Thanks for the nice and simple post. This limitation can be overcome if the KVM host has multiple interfaces using different ethernet segments subnets.


The ip element is supported since 0. When not specified, the default is “vfio” on systems where the VFIO driver is available and loaded, and “kvm” on older systems, or those where the VFIO driver hasn’t been loaded Since 1. Note To support integration with the deployment examples, kacv content configures the Macvtap mechanism driver to use the overlay network for untagged flat or tagged VLAN networks in addition to overlay networks such as VXLAN.

Virtualized bridged networking with MacVTap – Seravo

Thank you again for this wonderful guide! Only compute resources can be attached via macvtap. It will appear here shortly if it isn’t spam. So why would one want to use macvtap interfaces, instead of a Linux bridge or Open vSwitch?

But until then, I suggest you just stick with mxcv bridged networking. Ask Fedora requires javascript to work properly, please enable javascript in your browser, here is how. This snippet of XML code defines a Libvirt network that uses macvtap interfaces associated with the eth1 physical interface: