Linux Networking Cookbook

3.3. Configuring Network Interface Cards on Fedora

Problem

You have installed Fedora Linux on your firewall box, and now you're ready to give your network interface cards their final, working configurations.

Solution

Fedora gives each network interface a separate configuration file. You'll be editing /etc/sysconfig/network-scripts/ifcfg-eth0 and /etc/sysconfig/network-scripts/ifcfg-eth1.

First, configure the LAN interface with a static IP address appropriate for your private addressing scheme. Don't use DHCP to assign the LAN address.

Configure the WAN interface with the account information given to you by your ISP.

These examples show how to set a static local IP address and a dynamic external IPaddress.

Do not connect the WAN interface yet.

In this example, eth0 is the LAN interface and eth1 is the WAN interface:

	##/etc/sysconfig/network-scripts/ifcfg-eth0
	#use your own MAC address and LAN addresses
	DEVICE=eth0
	HWADDR=11:22:33:44:55:66
	BOOTPROTO=none
	ONBOOT=yes
	NETMASK=255.255.255.0
	IPADDR=192.168.1.23
	NETWORK=192.168.1.0
	USERCTL=no

	##/etc/sysconfig/network-scripts/ifcfg-eth1
	#use your real MAC address
	DEVICE=eth1
	HWADDR=AA:BB:CC:DD:EE:FF
	BOOTPROTO=dhcp
	USERCTL=no

How do you get the MAC addresses and interface names? Run ifconfig -a:

	$ ifconfig -a
	eth0 Link encap:Ethernet HWaddr 00:0B:6A:EF:7E:8D
	[...]

And that's all you need to do, because you'll get all your WAN configurations from your ISP's DHCP server.

If your WAN address is a static IP address, configure the WAN NIC the same way as ...