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Untangle

Spam Blocking And Web Filtering With The Untangle 5.3 Network Gateway

Post date: September 4, 2008, 10:09 Category: Security Views: 8634 Comments
Tutorial quote: Untangle bundles common open-source applications for blocking spam, spyware, viruses, adware and unwanted content on the network in one single Linux distribution. It can be integrated into existing networks either as a router or as a transparent bridge (directly behind the router, but before the switch that connects the client PCs with the router). The best thing about Untangle is that you do not have to reconfigure the client PCs - Untangle works out of the box.
Debian

Disk Based Backups With Amanda On Debian Etch

Post date: September 23, 2007, 10:09 Category: Miscellaneous Views: 4560 Comments
Tutorial quote: This document describes how to set up Amanda (The Advanced Maryland Automatic Network Disk Archiver) on Debian Etch. For this tutorial I chose Ubuntu v7.04 as a backup-client. The resulting system provides a flexible backup system with many features. It will be able to back up multiple hosts via network to various devices. I chose the disk based backup for this howto.
Debian

How To Create A Local Debian/Ubuntu Mirror With apt-mirror

Post date: January 4, 2007, 20:01 Category: Miscellaneous Views: 4122 Comments
Tutorial quote: This tutorial shows how to create a Debian/Ubuntu mirror for your local network with the tool apt-mirror. Having a local Debian/Ubuntu mirror is good if you have to install multiple systems in your local network because then all needed packages can be downloaded over the fast LAN connection, thus saving your internet bandwidth.
Ubuntu

Create a LAN for Virtual Servers with KVM and VDE

Post date: November 11, 2008, 19:11 Category: System Views: 4573 Comments
Tutorial quote: You have one host [ hoster ] running KVM on UBUNTU with 1 network interface accessing to internet.You want to have 2 debian etch virtual servers [ guest ] ( debian01 and debian02 ) running on your hoster with network access between them and hoster in a local LAN. In this case virtual servers will not be able to access to internet, but later I will explain how to do it.
Unix+clones

A web server in a shell script

Post date: March 14, 2006, 08:03 Category: Programming Views: 17322 Comments
Tutorial quote: Suppose you want to experiment a little with web pages and CGI's, but you don't want the hassle of installing the full Apache package. This quick and dirty shell script could just be what you need.

Put simply, a web server is an application that sends local text files over the network to the clients that request them. If you let another program (for example inetd) deal with the network part, the web server could be reduced to a mere cat "$filename" to stdout. Of course, the difficult part would be to extract that filename out of the HTTP request string: nothing that a Bash script cannot easily do!
Ubuntu

Enable WPA Wireless access point in Ubuntu

Post date: February 15, 2007, 01:02 Category: Network Views: 5281 Comments
Tutorial quote: I have a Thoshiba laptop at home, I was running “Edgy Eft” (Ubuntu Linux 6.10) But one of the important things about it was its inability to connect to WPA-encrypted Wifi access points.In my home i have a WPA Enabled Wireless router so i need to connect to my wireless network using WPA.I am giving the procedure that worked for me to enable wpa in my toshiba laptop.This will work most of ubuntu users who is trying to access WPA network.
Ubuntu

Setting up squid proxy server on Ubuntu (Quick Start Guide)

Post date: October 10, 2010, 05:10 Category: Software Views: 5323 Comments
Tutorial quote: Squid is an internet proxy server that can be used within a network to distribute an internet connection to all the computers within the network. One central computer is connected to the internet through any means such as dial-up, cable modem, ISDN, DSL, or T1, runs squid, and thus acts as the firewall to the internet. Because it is a proxy, it has the capabilities to log all user actions such as the URLs visited. There are many features that can be configured in squid. This guide is meant to be a quick start guide for those who are eager to get squid working and then configure it from there.
OpenSUSE

IPTraf - Console based IP Traffic Monitor in openSUSE

Post date: March 3, 2009, 05:03 Category: Network Views: 7437 Comments
Tutorial quote: IPTraf is a console-based network statistics utility for Linux. It gathers a variety of figures such as TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte counts. IPTraf is an IP traffic monitor that shows information on the IP traffic passing over your network.
BSD

Firewalling with OpenBSD's PF packet filter

Post date: April 19, 2005, 02:04 Category: Network Views: 7866 Comments
Tutorial quote: PF operates in a world which consists of packets, protocols, connections and ports.

Based on where a packet is coming from or where it's going, which protocol, connection of port it is designated for, PF is able to determine where to lead the packet, or decide if it is to be let through at all.

It's equally possible to direct network traffic based on packet contents, usually referred to as application level filtering, but this is not the kind of thing PF does. We will come back later to some cases where PF will hand off these kinds of tasks to other software, but first let us deal with some basics.

We've already mentioned the firewall concept. One important feature of PF and similar software, perhaps the most important feature, is that it is able to identify and block traffic which is you do not want to let into your local network or let out to the world outside. At some point the term 'firewall' was coined.
Debian

Using the 'snort' Intrusion Detection System

Post date: December 27, 2005, 15:12 Category: Security Views: 5523 Comments
Tutorial quote: Snort is the leading open source Network Intrusion Detection System and is a valuable addition to the security framework at any site. Even if you are employing lots of preventative measures, such as firewalling, patching, etc., a detection system can give you an assurance that your defences truly are effective, or if not, will give you valuable information about what you need to improve.

Fortunately, there is a good set of snort packages for Debian which takes a lot of the tedious work out of building a useful Network Intrusion Detection System. Before we start on installation, we should review a few details about the networking satack that you're going to need to make sense of the alerts snort will generate. Impatient readers and those who are familiar with the TCP/IP suite of protocols may do now skip to the bit that says Stand alone snort.
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