3.11.4. ifup - bring a network interface up Usage

ifup [-af] [INTF] Synopsis

Each INTF must have a script /env/network/INTF that set the variables ip (to ‘static’ or ‘dynamic’), ipaddr, netmask, gateway, serverip and/or ethaddr. A script /env/network/INTF-discover can contains for discovering the ethernet device, e.g. ‘usb’. Options

-a bring up all interfaces
-f Force. Configure even if ip already set