Solaris network virtualization and resource control
Solaris network virtualization and resource control is a set of features originally developed by Sun Microsystems as the OpenSolaris Crossbow umbrella project, providing an internal network virtualization and quality of service framework within the Solaris Operating System. It also enables secure and efficient virtual network interfaces and zones, making it easier to manage network resources.
Source: Wikipedia — Solaris network virtualization and resource control (CC BY-SA 4.0)