Linux Gateway

Setup Networking

At this point, you just installed your os but it does nothing. You can't telnet to it or anything else. The problem is that you need to download some source code for the kernel and other things to make this a functional machine. Thus you need to get at least one of your network interfaces working. If you haven't already, move this machine into it's final resting spot. Plug in the ethernet cables for the internal and external network. In my many tests of this documentation, the nic in the lowest numbered slot turns out to be eth1 and the higher numbered slot is eth0. In my machines, the lowest numbered slot is the one closer to the power connector.

Now your machine is in place, on, and you are logged in as root. Change into the /etc/sysconfig directory.
cd /etc/sysconfig

Alter /etc/sysconfig/network to look like:

NETWORKING=yes
FORWARD_IPV4=true
HOSTNAME=gateway.yourdomain.com
DOMAINNAME=yourdomain.com
GATEWAY=24.3.100.1
GATEWAYDEV=eth0

Then cd into /etc/sysconfig/network-scripts and move the file ifcfg- to ifcfg-eth0. Like...
cd /etc/sysconfig/network-scripts
mv /etc/sysconfig/network-scripts/ifcfg- /etc/sysconfig/network-scripts/ifcfg-eth0

Alter /etc/sysconfig/network-scripts/ifcfg-eth0 to look like:

DEVICE=eth0
IPADDR=24.3.100.100
NETMASK=255.255.255.0
NETWORK=24.3.100.0
BROADCAST=24.3.100.255
ONBOOT=yes

Then copy the file ifcfg-eth0 to ifcfg-eth1. Like...
cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth1

Alter /etc/sysconfig/network-scripts/ifcfg-eth1 to look like:

DEVICE=eth1
IPADDR=192.168.1.1
NETMASK=255.255.255.0
NETWORK=192.168.1.0
BROADCAST=192.168.1.255
ONBOOT=yes

Load The Kernel Module

Now you need to load the kernel module for you network cards. Using my example of maxtech nx32-pci cards, I typed the following command.

/sbin/modprobe ne2k-pci

The kernel should respond with some information about the cards that it finds. Then type...

ifup eth0
ifup eth1

And finally...

/sbin/ifconfig

to verify that both interfaces are configured. Then you should ping some machine on both networks just to make sure things work. If you reboot for some reason, you will have to repeat the "Load The Kernel Module" step.