by March 10, 2007 0 comments



Once you’ve installed the desktop edition of PCQLinux 2007, you can customize
it according to your environment. Let’s see how to add/ remove programs,
configure the firewall and other security settings, and configure the
networking.

Add/Remove Program
The Add/Remove Software option in PCQLinux 2007 Desktop edition is of great use
and this Linux distro lets you do this easily. When you open the Add/Remove
Software option under the application menu, it pops up a window called ‘Package
Manager’, which has Browse, Search and List options.

Drilling down the Browse option, you will find other options like Desktop
Environment, Application, etc in which applications are grouped. When you select
any one of these you will find the grouped application on the right box, where
you can see what all is installed and what’s not.

For removing the software, uncheck the checkbox provided and click on Apply.
It, then, displays a window that shows the details of what you are removing from
your computer, so that if you want to remove them, click on Continue else
Cancel. Installing software is as simple as removing it, and you just have to
check the package you want to install and click on Apply. This will show you the
details of what all things are to be installed. You can then choose to install
or cancel the operation. And, of course, don’t forget to insert the PCQLinux2007
Desktop edition CD.

Package Manager displaying
different desktop environments which are installed and which are not

The ‘List’ option shows all details-all packages installed or not, etc. With
the ‘Search’ option, you can search for the packages that are installed and you
can also remove them. Note that search option is only to work with installed
packages.

Configure Security Policies
SELinux (Security-enhanced Linux) is used for enhanced security in Linux. It is
used to enforce MAC (Mandatory Access Control) architecture called flask in
Linux kernel.

It can enforce a security policy, defined by the administrator, over all
processes and objects in the system. You can configure this under the ‘Security
level and firewall’ option, which is under System>Administration. It lets you
enable and/or disable the SELinux settings. If you want to enable it, you
actually won’t have the enable option but two other options namely Permissive
and Enforcing. If you select any of these type, you have the option for policy
type which has three options-targeted, mls and strict–included in it. You also
have the option of modifying the SELinux policy.

Security Level
Configuration lets you Enable and Disable the Firewall and other Trusted
Services

Firewall
Configuring the firewall in PCQLinux is pretty simple. Just open up the
‘Security level and Firewall’ from System>Administration. There you will be
prompted for choosing security level for your computer. Under the Firewall tab,
you have the firewall enabling and disabling option. After you turn on you
firewall, you get a list of trusted services, which is actually what you can
permit access to, through the firewall. Other than this, you have an option
called ‘other port’, which lets you allow specific ports for custom developed
services or for any service which is not included in the firewall list.

Networking
If your computer is connected to network, there are two ways for obtaining an IP
address for it. One is the default setting (DHCP) in which your system will
automatically be assigned an IP by your administrator. Second one is assigning a
static IP address to your system. You get these options at System>
Administration>Network. Here in the network configuration window that pops up,
select the active Ethernet port and click on Edit. This opens a window with two
radio buttons for ‘Automatically obtain IP address settings with dhcp’ (default)
and ‘Statically set IP address ‘. In the latter, you have to assign a static IP
address to your computer. Note that your IP address should not match with anyone
else on the network. You’ve to provide three things: IP Address, Subnet mask and
default gateway address to complete setup.

Configure Wi-Fi access
Today most WiFi cards available in the market work with Linux seamlessly. All
you have to do is to plug in the card in your PCQLinux 2007 machine (notebook or
desktop) and the hardware finder application, called Kudzu, will automatically
detect and load the driver for it. Once done, you can go to the wireless
configuration tool in System>Administration>Network. Make sure that your
wireless card is identified and is displayed under Hardware tab. After this is
done, go to Edit button to set the ESSID, Mode, and WEP key for you wireless
network. You can Monitor and Activate the wireless interface using the Network
Monitor.

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