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A computer with Ubuntu OS Two network cards Internet connectivity Knowledge of iptables.
eth1 = Network adapter connected to the Internet (external) eth0 = Network adapter connected to a computer in the same subnet (internal) 10.10.6.0 = Subnet for eth0 192.168.1.8 = IP address of Host A, any computer in the Internet 10.10.6.203 = IP address of eth0. 10.10.6.204 = IP address of eth1. 10.10.6.205 = IP address of Host B, any computer in the same subnet. Figure 2 : Configuration of eth0 Figure 3 : Setting up network on eth0 Figure 4 : Configuration of eth 1.
Figure 5 : Setting up network on eth 1.
The author works in the IT division of one of the largest commercial automotive organisations in India. His technical interests include Linux, networking, backups and virtualisation.
Configuring network interface cards Each network interface has to be assigned a static IP address. How to do this differs for the desktop edition and the server edition of Ubuntu. Both the methods are described below. You can refer Figure 2 to 5 For Ubuntu’s desktop edition: Click on System Settings ? Network ? Select Interface ? Options For Ubuntu’s server edition : You need to follow the steps given below. 1. Open the terminal, by pressing Ctrl+Alt+T 2. Enter the following command to edit the ‘interfaces’ file:

Gateway set-up The pre-requisites to setting up a gateway are:
From Ubuntu 10.10 onwards, it is sufficient to edit /etc/sysctl.conf and uncomment:
so that it reads as follows:
3. Edit the file with the following lines:
IP masquerading To enable IP masquerading, enter the following set of commands at the terminal:
Edit /etc/sysctl.conf , and add the following lines (for versions up to Ubuntu 10.04):
If you have two network interface cards installed in your Ubuntu system, one of which connects you to the Internet and the other to a local network, then your system can be transformed into an immensely powerful router. You can establish basic NAT (Network Address Translation), activate port forwarding, form a proxy, and prioritise traffic to and from your system so that your downloading does not interfere with your gaming. This article describes how to set up your Ubuntu system as a router, which can later be configured as a firewall. It requires prior knowledge of ‘iptables’. The resulting set-up will help you to control traffic over ports and make your system less vulnerable to security breaches.
Figure 6 : Enable IP forwarding Figure 7 : Result.
Enable IP forwarding Configure the Ubuntu system so as to initiate routing between two interfaces by enabling IP forwarding:
How to Configure Ubuntu as a Router.
Two network cards will have to be installed in the computer. One connects to the Internet, which we will call eth1. The other connects to our internal network. We will call this card eth0.
Do not forget to save these iptables rules, or they will be lost after the next system reboot as they are stored in volatile memory.
The above command will activate previously saved iptables rules when the system reboots, making the changes permanent.
Figure 1 : Ubuntu as a router.
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