The virbr0 network interface is a virtual bridge interface used by virtualization software, such as libvirt, to connect virtual machines to the network.
The virbr0 interface is created and managed by the libvirtd daemon, which is responsible for managing virtualization on the system. When a virtual machine is started, it is connected to the virbr0 interface, which acts as a bridge between the virtual machine and the physical network. This allows the virtual machine to communicate with other devices on the network.
The virbr0 interface is usually created with a private IP address and is not directly accessible from the physical network. Instead, the virtual machines connected to the virbr0 interface can communicate with the outside world through NAT (Network Address Translation).
The virbr0 interface is typically used in conjunction with other virtualization tools, such as KVM (Kernel-based Virtual Machine) or Xen, to manage and control virtual machines on the system.
It's always a good idea to carefully review the documentation and understand the role of the virbr0 interface in virtualization on your system. This will help you properly configure and manage your virtual machines and ensure that they have the necessary network connectivity.