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As a long time tech geek one of the things I’ve found useful and interesting is technical books. Hacking, Programming, System Administration, Software, Protocols, Operating Systems. Even if I don’t actually work with that particular subject I still enjoy learning about it. Well thanks to hacknmod.com I’ve found a repository of thousands of free digitized tech books. Everything from the PHP Cookbook to Windows XP Annoyances can be found HERE Most of the files are in .pdf format but a few are in .chm and a couple in .html. Hacknmod.com also points us to another repository of knowledge HERE

Make sure you check out the original article HERE

As always if you have any questions comments or suggestions please post them in the comment section below.

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TCPDump. If you want to capture traffic you need to be using this tool. TCPDump is small lightweight and really easy to understand once you learn the basic syntax. It’s the perfect tool to gather info off the wired or wireless network. If you’re running it on a computer with dsniff installed you can use dsniff to route traffic through your computer and see everything your target is doing even on a switched network (See the article on How-To spy on other users on the local network from back in August ) (more…)

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For years the de-facto groupware suite was Microsoft Exchange and Outlook. Well as someone who prefers to not use Microsoft products if I can avoid it this has been somewhat of a problem. Sure there have been some projects that replaced some of the functionality of Exchange (Like Zimbra)  but there have always been problems. Things just never seemed to work quite right. That is until I tried Zarafa. Zarafa is an Exchange replacement that runs on Linux. Like a lot of recent Open Source projects the company responsible for Zarafa as made available both a Community (Read “free as in beer and speech”) version that has a restriction of 3 connected mapi (Outlook) clients and a paid version that you can pay for per client access license.

The key features of Zarafa are

1. Ajax based web interface (This is as close to Outlook in a web browser as I’ve ever seen)
2. Outlook support (versions 2000 to 2007)
3. Mobile support (Push email to Activesync devices (Windows Mobile or iPhone) via Z-Push
4. Active Directory/LDAP integration
5. POP3/IMAP support
6. MySQL support
7. Single Sign on support
8. Brick Level Backup (not in the community version) (more…)

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I love bypassing content filters. Here’s a fast and easy way you can use your computer at home (Running an OpenSSH server) to get past  web content filters at work or school.

Here’s what we need

1. A computer at home running an SSH server.
2. SSH port (22) open on your router to your SSH Server
3. A computer running Linux or Leopard

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Today I was having some troubles. I was trying to unmount a drive on my Linux server but I kept getting the

umount: /mnt/data: device is busy

message back. Well this means that some process is using a file on that drive. fuser to the rescue. I’ll take you through the steps I used to unlock this drive below.

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