To configure a controller, each network controller on a system must have a valid interface name. A single system may have multiple controllers; each controller must have a unique interface name. Several different types of controllers are available. Each type has its own special interface name. Most network software supports a maximum of four network interfaces by default.
You can get a list of the interfaces installed on a system using the hinv command:
% hinv -c network Integral ISDN: Basic Rate Interface unit 0, revision 1.0 Integral Ethernet: ec0, version 1The interface name for the Ethernet controller in this example is "ec0."