Free Linux Tutorials

Snort® is an open source network intrusion prevention and detection system (IDS/IPS) developed by Sourcefire.

Other definitions:
- Barnyard is an output system for Snort. Snort creates a special binary output format called unified. Barnyard reads this file, and then resends the data to a database backend. Unlike the database output plug-in, Barnyard manages the sending of events to the database and stores them when the database temporarily cannot accept connections.

-BASE is the Basic Analysis and Security Engine. It is based on the code from the Analysis Console for Intrusion Databases (ACID) project. This application provides a web front-end to query and analyze the alerts coming from a SNORT IDS system.

Obviously, this is really an old procedure, actually this is my documentation way back early 2006 when it’s my first time to work with asterisk. This procedure was implemented before in about 30-50 call center agents using softphones and it quite worked well.

So many things have changed, as we all know, from asterisk 1.2 to asterisk 1.6 , and Asterisk Management Portal is popularly known now as FreePBX. Other packages were also updated now, many changes but still asterisk is standing there as the best open source telephony system.  We had many community and commercial PBX softwares today that are asterisk-based, that’s how big asterisk right now comparing back 2006

Do you want a free Web Conferencing? Then you can try DIMDIM.
Dimdim lets anyone deliver synchronized live presentations, whiteboards and web pages and share their voice and video over the Internet – with no download required

Official Dimdim Website:  www.dimdim.com

You can try the Open source Community Edition.

This is based on Dimdim Installation Procedure for CentOS

This step-by-step procedure was tested and implemented successfully on CentOS 5.2 32 bit (64 bit won’t work since the dimdim installation pack is for 32-bit only)

Requirements

* Setting up ftp via vsftpd in linux

The VSFTPD (Very Secure FTP Server Deamon) is one of the most commonly used FTP servers under Linux and comes with most Linux distributions.

This article will help you install and configure vsftpd in Linux. (sample OS used is a Red-hat based distribution)

GOALS:

* to create a secure ftp server
* to create an ftp user chrooted or jailed in a certain directory (sample use is an apache directory wherein you can limit users or your developers to just upload to a restricted folder)

Finding CPU utilization is one of the important tasks in systems administration. There are built-in and 3rd party tools that you can use to perform this task.

1. top – displays Linux tasks
this is the most common command used in getting CPU usage

#top

2. mpstat – display CPU individually and processors related stats.
In order to use this, package “sysstat” should be installed. you can use apt-get (debian-based) or yum (red-hat based) command to install it via internet

#yum install sysstat

#mpstat

#mpstat -P ALL

3. sar – Collect, report, or save system activity information.

These commands will work with most (if not all) distributions of Linux as well as most (?) implementations of Unix.

Communication
ftp – File Transfer Protocol.
login – Sign on.
rlogin – Sign on to remote system.
rsh – Run shell or single command on remote system.
talk -Exchange messages interactively with other terminals.
telnet – Connect to another system.
tftp – Trivial file transfer protocol.

Comparisons

cmp – Compare two files, byte by byte.
comm – Compare items in two sorted files.
diff – Compare two files, line by line.
diff3 – Compare three files.

One of my favorite linux distribution, Slackware, had released their version 13.0.

One of the significant change is the release of the official 64-bit.  Their is also a completely reworked on the  collection of X packages, major upgrades to the desktop environments for KDE and Xfce.

Full Official announcement in:

http://www.slackware.com/announce/13.0.php