<1> *HWaddr* This is your MAC address. *eth0* is the first Ethernet interface. (Additional Ethernet interfaces would be named *eth1,* *eth2,* etc.) This type of interface is usually a NIC connected to the network by a category 5 cable.
<2> *lo* is the loopback interface. This is a special network interface that the system uses to communicate with itself.
*Configuring an interface*
ifconfig can be used at the command line to configure (or re-configure) a network interface.
This is often unnecessary since this configuration is often handled by a script when you boot the system. If you'd like to do so manually, you will need superuser privileges, so we'll use sudo again when running these commands.
