openstack-manuals/doc/image-guide/source/net-running.rst

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Verify the libvirt default network is running
=============================================
Before starting a virtual machine with libvirt, verify
that the libvirt ``default`` network has started.
This network must be active for your virtual machine
to be able to connect out to the network.
Starting this network will create a Linux bridge (usually
called ``virbr0``), iptables rules, and a dnsmasq process
that will serve as a DHCP server.
To verify that the libvirt ``default`` network is enabled,
use the :command:`virsh net-list` command and verify
that the ``default`` network is active:
.. code-block:: console
# virsh net-list
Name State Autostart
-----------------------------------------
default active yes
If the network is not active, start it by doing:
.. code-block:: console
# virsh net-start default