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====== Remove vibr0 ======

The default one, created when the libvirt daemon is first installed and started, shows up as virbr0. It will act as a gateway for the VMs to route traffic. libvirtd will also insert iptables rules in iptable configuration for proper routing/natting of VM packets.

If you dont want to use libvirtd service, you can stop the same which will remove all these network configurations from the system for virbr0 interface.

lxcbr0 – is a virtual bridge created when you install and configure lxc container with package lxc. you may also remove this interface if not running any lxc containers.

===== Not using libvirtd service =====

Check the status of the service and disable the libvirtd service using systemctl command.
<cli prompt='#'>
# systemctl stop libvirtd.service

# systemctl status libvirtd.service
● libvirtd.service - Virtualization daemon
  Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
  Active: inactive (dead) since Fri 2016-10-07 11:04:31 IST; 2s ago
  Docs: man:libvirtd(8)
  http://libvirt.org
  Process: 1275 ExecStart=/usr/sbin/libvirtd $LIBVIRTD_ARGS (code=exited, status=0/SUCCESS)
 Main PID: 1275 (code=exited, status=0/SUCCESS)
</cli>

To disable the service permanently.
<cli prompt='#'>
# systemctl disable libvirtd.service
Removed symlink /etc/systemd/system/multi-user.target.wants/libvirtd.service
</cli>

===== Using libvirtd and dont want “virbr0” =====

In this scenario libvirtd service will be kept running but we will remove the virbr0 interface. Follow the steps below to remove the virbr0 interface.

List the default network set-up for the virtual machines
<cli prompt='#'>
# virsh net-list

Name       State    Autostart    Persistent
----------------------------------------------------------
default    active   yes          yes
</cli>

Destroy the network default.
<cli prompt='#'>
# virsh net-destroy default
Network default destroyed
</cli>

Permanently remove the default vitual network from the configuration.
<cli prompt='#'>
# virsh net-undefine default
Network default has been undefined
</cli>

The interface virbr0 is now gone. You can verify it in the ifconfig or ip command output.
<cli prompt='#'>
# ifconfig virbr0
virbr0: error fetching interface information: Device not found
</cli>

===== Removing lxcbr0 interface =====

lxcbr0 is a virtual bridge created when you install and configure lxc container with package lxc. To remove the lxcbr0 interface follow the steps given below.

change the below line in /etc/sysconfig/lxc. This will be effective after reboot.
change the line from
<cli prompt='#'>
USE_LXC_BRIDGE="true"
</cli>
to
<cli prompt='#'>
USE_LXC_BRIDGE="false"
</cli>

you may remove the lxcbr0 bridge interface for the running system. But this will not be effective after reboot. hence need to perform above step first. Lets first list the bridge interfaces.
<cli prompt='#'>
# brctl show
</cli>

Make the bridge interface down before removal
<cli prompt='#'>
# ip link set lxcbr0 down
</cli>

Now, remove the bridge using the ‘brctl delbr’ command.
<cli prompt='#'>
# brctl delbr lxcbr0
</cli>

check if the bridge is removed.
<cli prompt='#'>
# brctl show
</cli>
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