Ubuntu Router Internet Gateway
In this article you will learn how to setup your very own ubuntu router internet gateway. The ubuntu router / gateway will act exactly like any other router that you can purchase at the store, except your linux box will have more functionality and extra security. What you will need to build your ubuntu router:
- Extra computer
- (2) Ethernet cards
- Switch
- Ubuntu 10.04 LTS Server Edition
- Putty
This article will explain how to setup a fresh install of Ubuntu 10.04 server edition, configuring a dhcp server for a local network,while a including a firewall from the nasty internet. The first thing that you are going to do is a fresh install of the Ubuntu server edition, but selecting only Open SSH server during the software installation section of the Ubuntu install. After the installation completes and your pc reboots, you are then going to want to set a root password (su).
sudo passwd root
After you have a set a root password, login into root by typing the following command:
su
After you are in super user mode (root) we are then going to want to update our Ubuntu Bistro. Type the following commands to update the os and other programs.
apt-get update
apt-get upgrade
After your computer updates, restart it.
reboot
Setup Network Cards
vi /etc/network/interfaces
In the example below my eth0 represents the network interface that connects to the internet and the eth1 interface connect to switch. The switch then connects to all of your other networked devices, such as your gaming system and other networked devices. I added the following code into the /etc/network/interfaces file:
auto eth1
iface eth1 inet static
address 192.168.10.1
netmask 255.255.255.0
network 192.168.10.0
broadcast 192.168.10.255
/etc/init.d/networking restart
The next following step is not required, but I like to set a hostname for my gateway, all you have to do is install apache and you could have your own personal intranet or web server.
vi /etc/hosts
echo homeserver.gateway.2wire.net > /etc/hostname
/etc/init.d/hostname.sh start
hostname
hostname -f
Once you have completed the following above, you can use putty to access your linux machine from your windows based pc. This will allow you to copy and paste the following code, to speed up the process of creating your linux gateway. The first thing that you must do to use putty to configure your Ubuntu router, is set a static ip on your windows machine, since we don’t have a dhcp server installed yet. Set a static ip address for Microsoft Vista.If you don’t want to use putty you can just type out the rest of the code, putty just makes it easier. Once you have chosen your terminal program that your are going to use, again login under root. It is now time to install some software, that we will need to setup the gateway.
apt-get install dhcp3-server bind9 vim perl libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl libmd5-perl
Enable packet forwarding
vi /etc/sysctl.conf
# Uncomment the next line to enable packet forwarding for IPv4
net.ipv4.ip_forward=1
echo 1 > /proc/sys/net/ipv4/ip_forward
Install Webmin
Webmin is anther good program to use to configure you ubuntu gateway and other server programs that you might use. If you use webmin, you will be able to easily configure you server, using any web browser you choose.
cd /opt
mkdir webmin
cd /opt/webmin
wget http://prdownloads.sourceforge.net/webadmin/webmin-1.430.tar.gz
tar xzvf webmin-1.430.tar.gz
cd webmin-1.430/
./setup.sh
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