Linux security

Linux security

1) Firewalls are your guardian angels.

First of all, keep a software firewall active on your system, and restrict access to ports that allow remote access into your system, a good idea is to allow only a few select hosts access to ports used by services such as ssh (port 22) or telnet (port 23). Keeping a firewall in place ensures that you alone dictate who gets to access remote services on your computer and who doesn’t. To set up a firewall in linux, you can use the iptables program which comes standard with most linux distributions. However, iptables is quite difficult and complicated to set up correctly, and you will need to spend some time fiddling with the command line, but it is very flexible and powerful once configured correctly.

15 Tips to Improve your Linux Experience

     The beauty of Linux is in users ability to do large amount of customization to have a unique user expereince. So today we will look in to some tips for a “better” Linux experience. The term here is relative, because what works for me might seem a distraction for some or plain annoying to others; some of this “tips” might appeal to beginners, while advanced users might find it too easy. Hopefully some of these tips will be helpful to some of you.

1) Turn on your computer remotely by sending “magic network packets” to WakeOnLan supported network cards. This can be very helpful if you run a server at home but only access it occasionally. There is no need for you to have the server running all the time.

2) If you dual boot with windows, accessing Linux file system from your windows installation might be important for you. There are three windows applications that can help you do this: Explore2fs, Ext2 Installable File System, DiskInternals Linux Reader.

10 ways to Tweak your Linux Boot Process

     Linux rarely needs to be rebooted But when it does, it’s often slow to boot. Fortunately, there are ways to speed things up. Some of these methods are not terribly difficult. (although some, unfortunately, are). Let’s take a look.
#1: Disable unnecessary services

Depending upon the use of the machine, plenty of services won’t be needed. Using Linux just for a desktop? Then you won’t need sendmail, httpd, and many other services. If your server is only a Web server, you can shut off many services as well. To do this, you can go to the Administration menu and take a look at the Services entry. Just deselect all of the services you don’t want to start.
#2: Disable unnecessary kernel modules

Reboot Linux using simple fork

       We all know that the simplest function in Linux is fork(). The fork is used create a child process which is an exact copy of the calling process (parent process). You might be thinking how can such a simple function reboot a linux machine. Well I must tell you that the program I am going to discuss today uses only this fork  function and can force a Linux Server which can serve as many as 100 computers to get rebooted. I have tried this on my College’s Linux Server which Serves more than 200 computers at a time and I was lucky to get out of this situation.

Keyboard Shortcuts for Ubuntu

      Over the years that I have used Ubuntu, other than the usual Ctrl + C (copy) and Ctrl + V (paste) shortcuts, I have discovered quite a number of keyboard shortcuts that are very useful, but seldom used by many. If you are looking for more keyboard shortcuts to add to your collection, I am sure you will be able to find some new tricks here.

1. Switch to the next/previous workspace

If you make use of the workspace very frequently, you can easily switch between different workspaces by pressing Ctrl + Alt + Left/Right Arrow. The Left key brings you to the previous workspace while the Right key brings you to the next adjacent. If you have enabled Compiz, you can even get it to show all the workspace by pressing Super + E on the keyboard.

How to Hack Password of any Operating System

      One thing any hacker should know is how to hack into login account of any operating system. Major Operating Systems that are used these days are Windows, Linux and Mac. So today I will show you how to hack into these Operating Systems. Are you curious how easy it is for someone to gain access to your computer? If so, read on to see the technique one might use to figure out your computer password.