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Ubuntu Linux provides two firewall configuration options. The first is a basic yet effective and easy to use firewall configuration system called ''lokkit''. Another, more advanced, option is called ''GuardDog''.

The ''lokkit'' tool is not installed by default on Ubuntu Linux so before we can begin to configure a firewall we first need to install the appropriate package. There are two ways to do this, either using the Linux command-line, or using the Synaptic package managerPackage Manager.We will begin by looking at the Synaptic Package Manager method. To launch the Synaptic Package Manager click on the ''System'' menu on the desktop and select "Synaptic Package Manager'' from the ''Administration'' sub-menu. Enter your password when prompted to do so. The Synaptic Package Manager will appear as follows: [[Image:Example.jpg]]