**WARNING** Be on server as root. nmtui for graphical. RECOMMENDED using nmtui
virsh net-list --all
virsh net-edit default
ip link show type bridge
ip link show master br0

sudo ip link add br0 type bridge
sudo ip link set enp4so up
sudo ip link set enp4s0 master br0
sudo ip address add dev br0 192.168.1.121/24

______________________________________________________________________________
# Be on server as root. nmtui for graphical. RECOMMENDED using nmtui - see kvm-bridge-nmtui.pdf
sudo vi /etc/libvirt/qemu/networks/host-bridge.xml
#Add the following lines:
<network>
  <name>host-bridge</name>
  <forward mode="bridge"/>
  <bridge name="br0"/>
</network>
#Run the following commands to start the newly created bridge and make it as default bridge for VMs:
sudo virsh net-define /etc/libvirt/qemu/networks/host-bridge.xml
sudo virsh net-autostart host-bridge
# virsh net-destroy default
# virsh net-undefine default

# create file if not created
sudo vi /etc/sysctl.d/bridge.conf
# add the following lines
net.bridge.bridge-nf-call-ip6tables=0
net.bridge.bridge-nf-call-iptables=0
net.bridge.bridge-nf-call-arptables=0
# create file if not created
sudo vi /etc/udev/rules.d/99-bridge.rules
# add the following lines
ACTION=="add", SUBSYSTEM=="module", KERNEL=="br_netfilter", RUN+="/sbin/sysctl -p /etc/sysctl.d/bridge.conf"
# REBOOT SYSTEM

# sudo virsh net-start host-bridge
# sudo virsh net-autostart host-bridge
sudo modprobe vhost_net
sudo vi /etc/modules
# Add vhost_net

______________________________________________________________________________
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/configuring_and_managing_networking/index#proc_configuring-a-network-bridge-by-using-nmtui_configuring-a-network-bridge
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/configuring_and_managing_networking/index#configuring-a-network-bridge-by-using-nm-connection-editor_configuring-a-network-bridge
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/configuring_and_managing_networking/index#proc_configuring-a-network-bridge-by-using-nmstatectl_configuring-a-network-bridge

su - root
nmcli con show
ip link
virsh net-list --all
nmcli con del "Wired connection 1" # or delete UUID
nmcli con add type bridge autoconnect yes con-name br0 ifname br0 stp no
nmcli con add type bridge-slave autoconnect yes con-name eno1 ifname eno1 master br0
nmcli con mod br0 ipv4.addresses 192.168.1.222/24 ipv4.method manual
nmcli con mod br0 ipv4.gateway 192.168.1.131
nmcli con mod br0 ipv4.dns "192.168.1.140 192.168.1.141 192.168.1.143 192.168.1.144"
nmcli con mod br0 bridge.stp
# nmcli con mod $connectionName ipv4.ignore-auto-dns yes
nmcli con mod br0 bridge.stp no
service NetworkManager restart
nmcli device show
nmcli -f bridge con show br0