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OpenBSD

Transparent proxying with squid and pf

Post date: May 17, 2005, 08:05 Category: Network Views: 11959 Comments
Tutorial quote: squid is a caching web proxy, it's set up between web browsers and servers, fetching documents from servers on behalf of browsers. It can accelerate web access by caching frequently requested pages and serving them from its cache. It can also be used to filter pop-up ads and malware or to enforce access control (which clients may request what pages based on different authentication methods).

Traditionally, the proxy is an optional component, and browsers are configured to actively use the proxy. Transparent proxying means forcing all web traffic through the proxy without the cooperation (or knowledge) of the clients. Once all browser connections pass through the proxy, outgoing connections to external hosts can be restricted to the proxy, and direct connections from local clients can be blocked.

The OpenBSD packet filter (pf) can be used to redirect connections based on various criteria, including source and destination addresses and ports. For instance, one can redirect all TCP connections with destination port 80 (HTTP) that arrive through an interface connected to local workstations to a squid proxy running on a different address and port.
Unix+clones

Using MySQL to benchmark OS performance

Post date: April 12, 2005, 07:04 Category: Benchmarks Views: 3462 Comments
Tutorial quote: It seems to be an exciting time for *nix operating systems, with a number of them recently releasing new versions that bring the addition of expanded features and claims of improved performance. If you're using GNU/Linux, OpenBSD, NetBSD, FreeBSD, or Solaris as a database server, you've probably recently considered an upgrade or switch to another OS in that list due to marketing hype and hearsay. This article will show you how to benchmark operating system performance using MySQL on these OSes so you can find out for yourself if you're missing out. While this may not necessarily be indicative of overall system performance or overall database application performance, it will tell you specifically how well MySQL performs on your platform.

The following operating systems were used for the comparison testing:
- FreeBSD 4.11
- FreeBSD 5.3
- NetBSD 2.0
- Linux 2.6
- Linux 2.4
- Solaris 10 x86 (build 69)
- OpenBSD 3.6
PC-BSD

Creating PC-BSD Packages (.pbi's)

Post date: September 1, 2005, 02:09 Category: Software Views: 5840 Comments
Tutorial quote: I've found a neat, clean and fast way of creating PBI's that works 100%. and im writing this HOW-TO to explain it.
Unix+clones

Build Your Own IM Server with Jabber

Post date: June 26, 2005, 22:06 Category: Network Views: 5096 Comments
Tutorial quote: Instant messaging is a great business communications tool. For example, here at Enterprise Networking Planet the staff and writers all work in their pajamas at home, at far-flung points all over the globe. ENP's crusty editor-with-a-heart-of-gold Perry White lives in a villa in the South of France. I send in my columns from a sailboat currently anchored at Raratonga. Sure, we can exchange emails, but there are times when a live exchange is better.
Unix+clones

OpenOffice 2.0: Creating database forms

Post date: December 13, 2005, 12:12 Category: Software Views: 2854 Comments
Tutorial quote: ather than having a shallow affair with OpenOffice 2.0, we can use it to get a little more intimate with the data. We can even badger it into forming relations. Why force your database tables into a marriage with OpenOffice? Because, as with human relations, life -- and data -- are pretty meaningless without tight connections.

This tip on creating forms is part of a series I'm writing on OpenOffice.org 2.0 Base. So far, I've discussed making a plain database from scratch, creating tables, entering data using the table editor and a simple form and creating a view of a table or tables.

Let's start off with a description of what table relations are anyway, then discuss how to create a data entry form like this one, which has data from two related tables.
Ubuntu

How To Configure Remote Access To Your Ubuntu Desktop

Post date: February 14, 2008, 13:02 Category: Desktop Views: 4055 Comments
Tutorial quote: This guide explains how you can enable a remote desktop on an Ubuntu desktop so that you can access and control it remotely. This makes sense for example if you have customers that are not very tech-savvy. If they have a problem, you can log in to their desktops without the need to drive to their location. I will also show how to access the remote Ubuntu desktop from a Windows XP client and an Ubuntu client.
FreeBSD

Bluetooth Security Review, Part 1

Post date: April 30, 2005, 00:04 Category: Security Views: 3047 Comments
Tutorial quote: Bluetooth (BT) wireless technology provides an easy way for a wide range of devices to communicate with each other and connect to the Internet without the need for wires, cables and connectors. The technology seams to be very interesting and beneficial, yet it can also be a high threat for the privacy and security of Bluetooth users.
Linux

Splitting Apache Logs With vlogger

Post date: June 17, 2007, 22:06 Category: Software Views: 3316 Comments
Tutorial quote: Vlogger is a little tool with which you can write Apache logs broken down by virtual hosts and days. With vlogger, we need to put just one CustomLog directive into our global Apache configuration, and it will write access logs for each virtual host and day. Therefore, you do not have to split Apache's overall access log into access logs for each virtual host each day, and you do not have to configure Apache to write one access log per virtual host (which could make you run out of file descriptors very fast).
OpenBSD

OpenBSD encrypted raid disk

Post date: November 6, 2009, 10:11 Category: System Views: 5182 Comments
Tutorial quote: This document explain process to create encryped device with vnd driver stored on logical raid disk (Raid 1 - 0)
Debian

Setting up Subversion and websvn on Debian

Post date: September 18, 2006, 14:09 Category: Network Views: 6079 Comments
Tutorial quote: This howto will illustrate a way to install and configure Subversion and websvn on a Debian server with the following features:
- multiple repository Subversion
- access to the repositories via WebDAV (https, https) and ssh
- Linux system account access control and/or Apache level access control
- a secured websvn (php web application for easy code browsing)
- configured syntax coloring in websvn with gnu enscript
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