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How To Block Spam Before It Enters The Server (Postfix)

Post date: June 4, 2007, 23:06 Category: Security Views: 4243 Comments
Tutorial quote: The last few weeks have seen a dramatic increase in spam (once again). Estimates say that spam makes now up for 80 - 90% of all emails, and many mail servers have difficulties in managing the additional load caused by the latest spam, and spam filters such as SpamAssassin do not recognize large parts of that spam as they did before. Fortunately, we can block a big amount of that spam at the MTA level, for example by using blacklists, running tests on the sender and recipient domains, etc. An additional benefit of doing this is that it lowers the load on the mail servers because the (resource-hungry) spamfilters have to look at less emails.
Linux

nBox - Envision your network with nBox (Embedded Ntop)

Post date: May 28, 2007, 22:05 Category: Network Views: 3507 Comments
Tutorial quote: The life of a systems or network administrator requires us to maintain an expansive understanding of our network infrastructure to more effectively manage it. Amidst volumes of complex data that some IT problems present and network management is no exception to these complications. Visual tools allow us to better see trends and make sense of the macro view of our networks. Ntop, nBox, nProbe are just the right FOSS tools that can help us gain greater insight.
Linux

Filesystem Encryption Tools for Linux

Post date: May 28, 2007, 00:05 Category: System Views: 3384 Comments
Tutorial quote: Crypto filesystems keep your data safe – even if someone steals your computer.Linux offers a number of encrypted filesystem options – each with a different approach to the encryption problem.Encrypted filesystems may be overkill
for family photos or your résumé, but they make sense for network-accessible servers that hold sensitive business
documents, databases that contain credit-card information, offline backups, and laptops.
Linux

Running ISPConfig On Port 80 Using Apache's Reverse Proxy Feature (Debian Etch)

Post date: May 23, 2007, 22:05 Category: System Views: 4531 Comments
Tutorial quote: This article shows how you can configure a Debian Etch system that has the webhosting control panel ISPConfig installed so that ISPConfig can be accessed on port 80. By default ISPConfig uses port 81 which is a non-standard port and is blocked by some firewalls and ISPs. By using Apache's mod_proxy module, we can avoid this problem. It lets us create a reverse proxy that can fetch the pages from ISPConfig on port 81.
Linux

How to secure VNC remote access with two-factor authentication

Post date: May 21, 2007, 22:05 Category: Security Views: 3191 Comments
Tutorial quote: VNC is the most popular remote access solution today. However, it was developed to provide remote access, not to provide secure remote access. Administrators have to add security to VNC by tunneling it through an encrpyted channel such as SSH and adding a layer of authentication. In this article, we will show you how to combine the NoMachine NX server to encrpyt VNC and remote X session combined with two-factor authentication from WiKID Systems to create a secure, fast remote access solution.
Linux

QoS And Traffic Shaping For VoIP Users Using iproute2 And Asterisk

Post date: May 19, 2007, 22:05 Category: Network Views: 3433 Comments
Tutorial quote: The quality of my VoIP phone calls suffered whenever I was downloading or uploading anything. This was irritating, especially for those calling me (I heard them better than they heard me). So I poked at Iproute2 and other howtos, especially with regard to VoIP traffic, but I couldn't find anything that worked well. After some playing around, I've found settings that were right for me: consistant VoIP quality, regardless of any activities on the wire.
Linux

Secure Websites Using SSL And Certificates

Post date: May 16, 2007, 22:05 Category: Security Views: 3539 Comments
Tutorial quote: This article will guide you through the entire process of setting up a secure website using SSL and digital certificates. This guide assumes that you already have a fully functional (and configured) server running Apache, BIND, and OpenSSL. Just as a side note, this guide was written based on a Fedora Core 6 distribution, but should be the same for most other distros out there.
Linux

How To Back Up MySQL Databases Without Interrupting MySQL

Post date: May 12, 2007, 23:05 Category: System Views: 3559 Comments
Tutorial quote: This article describes how you can back up MySQL databases without interrupting the MySQL service. Normally, when you want to create a MySQL backup, you either have to stop MySQL or issue a read lock on your MySQL tables in order to get a correct backup; if you do not do it this way, you can end up with an inconsistent backup. To get consistent backups without interrupting MySQL, I use a little trick: I replicate my MySQL database to a second MySQL server, and on the second MySQL server I use a cron job that creates regular backups of the replicated database.
Linux

How To Utilize Your New Multimedia Keyboard Under Linux

Post date: April 28, 2007, 22:04 Category: Desktop Views: 2836 Comments
Tutorial quote: Xbindkeys is a program that allows you to launch shell commands with your keyboard or your mouse under X Window. It links commands to keys or mouse buttons, using its configuration file. It does not depend on the window manager and can capture all keyboard keys.
Linux

How To Implement SPF In Postfix

Post date: February 25, 2007, 21:02 Category: Miscellaneous Views: 4585 Comments
Tutorial quote: This tutorial shows how to implement SPF (Sender Policy Framework) in a Postfix 2.x installation. The Sender Policy Framework is an open standard specifying a technical method to prevent sender address forgery. There are lots of SPF extensions and patches available for Postfix, but most require that you recompile Postfix. Therefore we will install the postfix-policyd-spf-perl package from openspf.org which is a Perl package and can be implemented in existing Postfix installations (no Postfix compilation required).
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