Howtos / Articles

Connect to a PPTP VPN Server from Ubuntu Linux

This howto outlines how to connect to a PPTP VPN server from a Linux computer running Ubuntu (or a Ubuntu based distribution). It covers the installing of the PPTP VPN client, configuration, and connecting/disconnecting from the VPN connection.…

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Enable Apache Rewrite module on Ubuntu 12.04

By default, Ubuntu 12.04 doesn’t enable the rewrite engine module after installing Apache. The rewrite engine for Apache allows for on-the-fly URL rewriting/changing. This allows for the use of urls that are human readable, and SEO friendly. The rewrite engine is capable of capturing a website request, running it through a series of expression checks, and if a match is found, it will pass on the rewritten request to the web server. The end user would not notice anything different…

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Optimizing jpeg Image Files on Linux

Optimizing images can be a quick and easy way to shrink the file size of jpeg images, removing unneeded data within the file. This can reduce the time it takes users to download the images if they are on a web server. It can also be used to remove comment and exif data from the files, so there is no added information within the file, other than the image itself. “jpegoptim” is a free application that can be used to…

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Changing network interface numbers on Ubuntu

Have you ever replaced a network card on Ubuntu and found that it is now appearing as eth1, instead of eth0? Or simply wanted to swap the numbering of two network interfaces? This guide shows you how to do just that. Ubuntu uses the udev dynamic device management system, and automatically keeps track of what net card is assigned to what interface name. Udev allows for device name persistance using rule files, which are stored in “/etc/udev/rules.d/”. “70-persistent-net.rules” is the…

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Monitor your network for new hosts using arpwatch

For computers to communicate with each other over a network, they need to be able to know how to convert a IP address, into the physical address of the network card (MAC address). If your computer doesn’t have the MAC address for the specific host you are trying to communicate with, your computer will send out a broadcast ARP request, to find out who owns the IP you are trying to contact. These ARP requests are broadcast out over a…

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