A computer can have more than one IP address because it can have multiple network
interfaces. Each network interface must have an IP address to connect to a network
(even if the address is assigned temporarily). So, if you have two Ethernet cards (eth0 and eth1), each
needs its own IP address. Also, the address 127.0.0.1 represents the local host so that users on the
local computer can access services in loopback.
Here??™s how to define the IP address for your Ethernet interface in Fedora or RHEL:
1. From the red hat menu, choose Desktop???System Settings???Network or, as root user
from a Terminal window, type system-config-network. (If prompted, type the root
password.) The Network Configuration window appears.
2. Click the Devices tab. A listing of your existing network interfaces appears.
3. Double-click the eth0 interface (representing your first Ethernet card). A pop-up window
titled Ethernet Device appears (see Figure 5-6), enabling you to configure your eth0
interface.
4. Select your preferences:
Activate device when computer starts??”Check here to have eth0 start at boot time.
Allow all users to enable and disable the device??”Check to let non-root users
enable and disable the network interface.
Enable IPv6 configuration for this interface??”Check here if you are connected to
an IPV6 network.
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