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Tip: Blocking IP address of any country with iptables |
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Thursday, 19 February 2009 |
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This short article shows you how to automatically create iptables
rules to block all connection from one country or more. The blocklist
is create with an API I wrote and you can use wget to update the
blocklist monthly. The API to get the IP addresses to block. First you need to know the code (ISO 3166 format) of the country you would like to block.
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Tip: Cloning Linux Systems With CloneZilla Server Edition (CloneZilla SE) |
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Tuesday, 27 January 2009 |
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This tutorial shows how you can clone Linux systems with CloneZilla SE.
This is useful for copying one Linux installation to multiple computers
without losing much time, e.g. in a classroom, or also for creating an
image-based backup of a system. I will install CloneZilla SE on a
Debian Etch server in this tutorial. The systems that you want to clone
can use whatever Linux distribution you prefer.
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Remote access using NX and OpenSuse 11.1 |
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Friday, 16 January 2009 |
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NoMachine NX is a solution for secure remote access, desktop virtualization, and hosted desktop deployment using compression, session resilience and resource management. It integrations a powerful audio, printing and resource sharing capabilities and makes it possible to run any graphical application (e.g KDE, Gnome etc.) across the network connection. The NX Free Edition is easy to install and works on almost all Linux distributions. The following workshop describes the installation and the first run on an OpenSuse 11.1 server.
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Trick: Enable high-speed USB 2.0 support in your VM |
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Tuesday, 13 January 2009 |
If you have created your VM image using an earlier version of VMware Workstation or Server, you possibly see the following error messages or advice:
“"Please upgrade your virtual machine to enable high-speed USB 2.0 support for the device "Removable Disk". An attempt will be made to connect this device to the best available host controller. This may result in an undefined behavior for this device"
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Choosing a Secure Password - The Linux-Tip Approach |
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Sunday, 04 January 2009 |
Here is my question: Are “cyEma7;IkmH!” or “hot1BA-Bitso69” secure passwords? Yes definitely, but who (the hell) can remember it! YOU WILL - after reading this article!
Your passwords play a crucial role in protecting your computing accounts and the personal information that can be accessed through them.
One of the problems with passwords is that users forget them. For that reason people use simple password phrases like their dog’s name, their kid’s first name and birthdates, the name of the current month or everything in different combinations.
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Open Vulnerability Assessment System |
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Friday, 19 December 2008 |
OpenVAS stands for Open Vulnerability Assessment System and is a complete tool for network security scanning including a graphical user front-end. I is used to detect security problems in remote systems and applications. The OpenVAS development team consists of various interested parties from academia and commercial entities as well as individuals.
OpenVAS derives from the Nessus project which turned into a commercial product. All OpenVAS products are Free Software under the GNU General Public License (GNU GPL).
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Forensic investigation using free Linux tools |
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Saturday, 06 December 2008 |
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Here is a scenario you can think about. An administrator of a company has been accused of hoarding illegal material of questionable moral content on his company network system. You have been called upon to examine the suspect server and unearth evidence related to the said illegal material. Your boss has told you that you are not allowed to shutdown the server. Unfortunately no additional money is available to buy forensic tools or equipment. In this workshop we will explain, how to use free forensic tools to investigate such cases.
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Set up a SSH-based point to point connection |
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Sunday, 30 November 2008 |
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OpenSSH version 4.3 introduced a new feature: the ability to create on-the-fly "Virtual Private Networks" via the tunnel driver (the so-called "tun" driver). This allows you to create a network interface that bridges two physically disparate network segments in different locations. This article explains how to use SSH to set up SSH-based point to point connections with OpenSuse 11.0 which can then be used to create routes that create virtual private networks.
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Trick: Speed up your Internet access using Squid's refresh patterns |
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Friday, 21 November 2008 |
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Bandwidth limitation is still a problem for a lot of people who connect
to the Internet. You can improve your available bandwidth by installing
Squid caching proxy server on
your network with configuration parameters that will increase your byte
hit rate, giving you about 30-60% more bandwidth.
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