Various tool:
brctl ( bridge-utils package) create bridge, it will be attach to a "host interface" and will have an IP@
virsh ( libvirt ) create virtual network
ip addr ... ( replacing ifconfig ) configure l2 and l3 parameters
brctl ( bridge-utils package) create bridge, it will be attach to a "host interface" and will have an IP@
virsh ( libvirt ) create virtual network
ip addr ... ( replacing ifconfig ) configure l2 and l3 parameters