Setting up Bridge Interfaces for KVM

1. Update your /etc/netplan/00-installer-config.yaml file based on the below template

   network:
    ethernets:
        ens18:
            dhcp4: false
    bridges:
      br0:
        interfaces: [ens18]
        addresses: [Interface IP/Subnet]
        gateway4: gateway IP
        mtu: 1500
        nameservers:
          addresses: [8.8.8.8,8.8.4.4]
        parameters:
          stp: true
          forward-delay: 4
        dhcp4: no
        dhcp6: no
    version: 2
   

2. Run sudo netplan apply to apply the network changes you just made
3. create host-bridge.xml

    <network>
      <name>host-bridge</name>
      <forward mode="bridge"/>
      <bridge name="br0"/>
    </network>
   

4. Run sudo virsh net-define host-bridge.xml to create the KVM Bridge Interface
5. Run virsh net-start host-bridge to start the interface
6. Run virsh net-autostart host-bridge to enable the interface to run at start