• Nikto - Web Server Scanner

    Nikto is a web server scanner tool, which performs comprehensive checking against web servers for multiple items, including over 3500 potentially dangerous files/CGIs, versions on over 700 servers, and version specific problems more than 200 servers. Nikto is built on LibWhisker and can run on any platform which has a Perl environment, and supports SSL, proxies, host authentication, IDS...
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  • Intel Pro Wireless 3945 Configuration On Linux

      This article will guide you through the necessary steps to install ipw3945 wireless adapter on a CentOS / RHEL based distribution. Before we start, make sure that you have rpmforge repository configured. If you do not have, download it from here. # wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm # rpm -ivh...
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  • Release memory in Linux (Unused or Cached)

    In computer science, Memory Leakage occurs when a computer software or program consumes required memory but unable to memory after completing its task or when no longer needed to Operating System. There are two types of Memory Leakage. One is Virtual Memory Leakage and another is Real Memory Leakage. Now first Identify cached memory or unused memory by executing, ...
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  • Relay Emails using Gmail Account (Shell Prompt)

    If you are using Linux Desktop Operating System and do not want to set up an email server, use GMail account to relay emails. On Desktop OS, we can use GUI Email Clients, which supports POP3/IMAP to send an email but how about /usr/bin/mail or from cmd prompt? To fulfil your requirement, you need to install a simple program called ssmtp. It accepts a mail stream on standard input...
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  • Ubuntu Linux - Flush DNS cache

    Sometimes you may get old web results and old webpages even after updating the web pages. That means, DNS cache holds the problem. To solve this problem, execute below command to flush DNS cache.  # /etc/rc.d/init.d/nscd restart
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  • SparkleShare

    SparkleShare is a syncing and collaboration tool that shines by its absence. it's designed to get out of your way, to make sharing documents and collaboration easier, and to make peers aware of what you are doing says its project site. With SparkleShare, you are given an option to host your remote folder on your own server, Github, Gitorious, The GNOME Project. Sharing...
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  • GRUB Password Setting in Linux

    When your system is rebooted, grub presents the boot option menu called splace screen. From here, you or anybody can easily login into a single user mode (sometimes it is called Rescue Mode) without the password which might result into breaching computer security. You can set a password for the GRUB boot loader. This prevents users from rescue or Singe-User  mode or changing settings at boot ...
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  • SSH Brute Force Attacks Protection using DenyHosts

    You can easily block SSH server attacks including dictionary based attacks and brute force attacks using a Python based script - DenyHosts. It analyzes the sshd log messages to determine what hosts or IPs are attempting to hack into your system. STEP 1: Enable Rpmforge Repo in your system, For 32bit CentOS / RHEL Linux enter: # rpm -Uhv...
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  • Multi Router Traffic Grapher – MRTG on Linux

    The Multi Router Traffic Grapher (MRTG) is a network or resource monitoring tool used by System Administrators across the Globe. MRTG generates HTML pages containing PNG images, which provides a real time visual representation of network traffic and system resources. STEP 1: Install MRTG with required packages # yum install mrtg net-snmp net-snmp-utils -y STEP 2:...
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  • Bz2 tar file contents listing

    bzip2 compresses  files  using  the Burrows-Wheeler block sorting text compression algorithm, and Huffman coding.   Compression  is  generally considerably   better   than   that   achieved   by  more  conventional LZ77/LZ78-based compressors, and approaches the performance of the  PPM family of statistical compressors. To list the contents of a tar.bz2 file, use tar command as follows: ...
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  • Disable Interactive Startup in Linux

    Fedora, CentOS and RHEL allow the console user to perform an interactive system start-up by pressing [I] key. Using interactive boot, attacker can disable the security services and may get access to system. Open etc/sysconfig/init file and disable PROMPT option, # vim /etc/sysconfig/init PROMPT=no Now restart the system and...
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  • PowerDNS Installation on Linux

    PowerDNS is a DNS server, written in C++ and licensed under the GPL. It runs on most Unix derivatives and on Microsoft Windows. PowerDNS can be managed through a web interface (PowerAdmin). Install MySQL, # yum install mysql* -y After installation, start it and create system startup links for MySQL. # service mysqld start; chkconfig mysqld on If you want to set root password, # mysqladmin -u root...
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  • Apache Linux - Limiting User Upload File Size

    To restricts Users from uploading File Size, we can configure Apache with LimitRequestBody Directive. You can add this directive using .htaccess file or httpd.conf file under virtual host or directory configuration options. You can set value (in bytes) from 0 (unlimited) to 2147483647 (2GB) that are allowed in a request body. For example, limit /var/www/html/linuxarticles.org/uploads to 200K,...
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  • Monitor Failed Login Attempts

    In Linux you can use faillog command to display failed login attempts or you can set login failure limits. faillog formats the contents of the failure log from /var/log/faillog database / secure log file. It also can be used for maintains failure counters and limits. For RHEL/CentOS Linux 5.x, you need to modify /etc/pam.d/system-auth file to monitor or track failed login attempts. You need to...
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  • Linux - Turn off Beep Sound of Terminal

    Linux kernel has PC speaker bell driver called pcspkr.ko. It is responsible for generating beeps while users are working on Shell Prompts ( Both Virtual and GUI Terminals ). If you don't like it, simply remove driver from kernel. Login as a root and type the following command to unload the driver: # rmmod -v pcspkr Sample output: rmmod pcspkr, wait=no We...
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  • Ubuntu - Track MySQL Queries with mysqlsniffer

    Wireshark Network Analyzer is use full to track network packets. To sniff MySQL packets and decoding it, we will use mysqlsniffer. Note: This will not usually work for local connections. First, install libpcap-dev, which is the development library that allows an application to sniff network packets. $ sudo  apt-get install ...
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  • Performance Monitoring Using “vmstat” on Linux

    vmstat reports  information about processes, memory, paging, block IO, traps, and cpu activity. The first report produced gives averages since the last reboot.   Additional  reports  give information on a sampling period of length delay. The process and memory reports are instantaneous in either case. [root@linuxArticles.org ~]# vmstat -s 4087800  total memory 1643176  used m...
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  • Linux – Push configuration to user by “skel” directory

    By default, when we are creating new user to Linux OS, all files from /etc/skel are copied to the new user's home directory. There are few files included in /etc/skel/ by default. * /etc/skel/.bash_logout * /etc/skel/.bashrc * /etc/skel/.profile * /etc/skel/.cshrc If you want to share some files, including rules and regulations to new users, simply add it...
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  • Windows Fonts in Linux

    Do you want to create a document using windows fonts in Linux? No problem, please install windows fonts using one of mentioned method. Method 1: Copy the *.ttf (True Type Fonts) fonts like Arial, Tahoma, Verdana, Courier New and Times New Roman from the windows partition to the fonts:// location in nautilus. Method 2: For Ubuntu users, and since Ubuntu does not have a...
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  • Disable PING response in Linux

    Ping is used to check how many systems are up. Most of the hackers are using ping for finding the hackable machine. The hacking chances can be reduced by turning off ping response. For RHEL/Cent OS/Fedora Linux, open terminal as a root and execute, # sysctl -a | grep icmp net.netfilter.nf_conntrack_icmp_timeout = 30 net.ipv4.icmp_echo_ignore_all =...
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  • Reset root password in Linux

    There are a number of different ways to do root password recovery on a Linux system. Different distributions make it easier than others. You must be physically in front of the system. For Red Hat and Mandrake: Boot from your first install CD and as the very first screen comes up hit F2 and type: rescue ( For RedHat "linux rescue" ) and the computer will boot in rescue mode....
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  • Download YouTube Videos in Linux

    Do you want to Download your favorite you tube video in Linux? No problem! Here I have mentioned all steps to download you tube video using Linux Terminal.   Step 1: Install youtube-dl package by executing, On Ubuntu, $ sudo apt-get install youtube-dl On Fedora, RedHat, CentOS, # yum install youtube-dl -y Step 2: After having successfully installed youtube-dl, open a...
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  • Dropbox

    Dropbox is a Web-based file hosting service operated by Dropbox, Inc. which uses cloud computing to enable users to store and share files and folders with others across the Internet using file synchronization. It was founded in 2007 by MIT graduates Drew Houston and Arash Ferdowsi as a Y Combinator startup says Wikipedia.   To install DropBox on your system, download appropriate rpm for your...
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  • Checksum Verification Using ISO Image

    After downloading ISO file from Fedora/CentOS, you can check the integrity of the ISO-file with a checksum, the md5sum. The mirror will offer you a separate text file to download with a 128 bit string of characters. This string has to be exactly the same as the one you get when you do: # md5sum file.iso 0c0f8ff9b6fb60a4778288de0d9e7f46  file.iso We assume that, you have downloaded ...
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  • Back Up files by sending it to Gmail

    Nowadays, GMail servers are very much reliable and give you a couple of GiBs for free of cost! So, it is the best place to store your linux system's important data. In order to accomplish this, first create a directory named “backup” in the root directory of your system: # cd / && mkdir backup Now, you need to create a script, which will perform backup and mail it for you...
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YUM – Exclude Package Update

Jun 8th

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YUM is an interactive, rpm based, package manager. It can automatically perform system updates, including dependency analysis and obsolete processing based on “repository” metadata. It can also perform installation of new packages, removal of old packages and perform queries on the installed and/or available packages among many other commands/services

FireFox – Update In an Easy Way

Jun 8th

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Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. To update Firefox, you don’t need to wait for rpm / deb, rather you can upgrade from application itself. Follow below steps to update it.

ThunderBird Installation in Linux

Jun 7th

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Mozilla provides Linux packages for Firefox / Thunderbird, but many of users prefer using packages available with distro. As a result you need to wait until your favorite disto release latest rpm / deb or find alternative repo to get latest packages. Rather hunting you may start using TAR packages available at mozilla.

RRDTOOL Installation on Linux

Jun 7th

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RRDtool is the Open Source industry standard, high performance data logging and graphing system for time series data. Use it to write your custom monitoring shell scripts or create whole applications using its Perl, Python, Ruby, TCL or PHP bindings.

Fonts Installation in Linux

Jun 6th

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Sometimes you may required to install fonts in Linux. So that websites look as it should look on windows or on other OS. To install fonts in Linux, copy all *.ttf fonts in /usr/share/fonts. Download sample *.ttf font from here. # wget www.WebpagePublicity.com/free-fonts/o/Old Republic.ttf All you need to do is to create separate folder under…

VLC Media Player Installation on Linux

Jun 6th

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To play music or video in Linux, we need to install media player. VLC is one of the most famous media player to play videos.

Play MP3 Songs in Fedora

Jun 4th

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By default fedora does not provide totem plugins to play mp3 audio. To get it working, download rpmfusion repository and install required packages.  # wget http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm # rpm -ivh rpmfusion-free-release-stable.noarch.rpm Now install required packages or plugins to play mp3. # yum install *gstreamer* mplayer -y Note: Generally we need only gstreamer-plugins-bad, gstreamer-ffmpeg, and gstreamer-plugins-ugly. But…

DHCP Server Configuration on Linux

Jun 3rd

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The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks. Computers that are connected to IP networks must be configured before they can communicate with other computers on the network. DHCP allows a computer to be configured automatically, eliminating the need for intervention by a network administrator. It also provides…

SARG

Jun 1st

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SARG – Squid Analysis Report Generator Configuration is a tool that allow you to view “where” your users are going to on the Internet. SARG provides many information about Squid users activities like, times, bytes, sites, etc… Download latest version of SARG from here. # wget http://downloads.sourceforge.net/project/sarg/sarg/sarg-2.3.1/sarg-2.3.1.tar.gz?r=http%3A%2F%2Fsarg.sourceforge.net%2Fsarg.php&ts=1291380140&use_mirror=biznetnetworks You need to update sarg.conf for your proxy…

SQUID – Caching Proxy Server Installation on Linux

May 31st

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Squid is a proxy server and web cache daemon. It has a wide variety of uses, from speeding up a web server by caching repeated requests; to caching web, DNS and other computer network lookups for a group of people sharing network resources; to aiding security by filtering traffic. Squid is available with major Linux…

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