XigmaNAS

A virtual local area network, virtual LAN or VLAN, is a group of hosts with a common set of requirements, which communicate as if they were attached to the same broadcast domain, regardless of their physical location. A VLAN has the same attributes as a physical local area network (LAN), but allows end stations to be grouped together even if not on the same network switch.

Also see:
Virtual LAN on Wikipedia.org

Above: adding an onboard NIC.

Above: now both the onboard and Intel NIC are added.