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Various tool:

ifconfig ( and a file # if configuration )

brctl ( bridge-utils package) create bridge,  it will be attach to a "host interface" and will have an IP@, tipical usage: mgt bridge or second interface/back up link

...

Create a virtual network with virsh

main directory: /etc/libvirt/qemu/networks/

virsh net-define virbr1.xml
virsh net-start virbr1
virsh net-autostart virbr1