KiloXray's Linux Resources

Here are resources I find useful for Redhat's Fedora (FC4 & FC6) Linux:

Official Fedora Site

The official Redhat Fedora main page: http://fedora.redhat.com
Redhat is currently transitioning all Fedora related pages to: http://fedoraproject.org/wiki/

Fedora Discussion Forums

A public Fedora discussion forum: http://www.fedoraforum.org. Note: this forum used to be very good but I have noticed a significant drop in quality somewhere towards the end of 2006. Lets hope it picks back up to where it used to be.
Linux forums is a general Linux discussion board. It includes infomration relevant to many flavors of Linux: http://www.linuxforum.com

Different Tutorials and Installation Guides

The Linux Documentation Project is a good starting point for many questions even though it is not designed to address the different flavors of Linux

IPTABLES is one of the most important and powerful services built into the kernel. Here is an excellent online tutorial. Please note that this page should NOT be viewed with IE6/7.

http://iptables-tutorial.frozentux.net/iptables-tutorial.html
Here is a PDF I made for myself as a quick reference. This pdf is a capture of the referenced tutorial.

SMTP-AUTH: Jon Fullmer wrote a very nice tutorial explaining how to enable smtp authentication. While not written for Fedora, it is easy to implement on a Fedora based machine. BTW, isn't it about time IETF adopts a secure email protocol?

VSFTP is probably the most powerful FTP server for Linux based platforms. It is simple, clean and well documented.

APACHE is the defacto standard for Internet web servers. I haven't even scratched the surface of this powerful server but every time I look for some feature - it has it!

IPSEC seems to be the future of secure Internet communications. There were several excellent packages out there including the now dead FreeSwan. Fortunately, since IPv6 requires IPsec to be a built in as part of the stack, Linux kernels version 2.6 and newer now support IPsec natively. Don't forget you need to enable protocols 50 (ESP), 51 (AH), and sometimes ports 500 and 4500 for UDP.

The official Linux IPSec howto includes some very good references and tutorials.
Even though FreeSwan is dead, it still has some very good configuration documentation for different configurations.
Racoon is at the heart of IPsec configuration, here are the manual pages.
Another good racoon tutorial focusing on roadwarrior configurations.

POPTOP is a PPTP based VPN server. PPTP is Microsoft's own implementation of a secure VPN server. PPTP has been criticized for security flaws by many industry security experts including Bruce Schneier. The reasons I do like it for some applications is that it is very easy to install and maintain, very robust on Fedora, every WinXP based machine has built in support for it - making it ideal for roadwarriors, and works seamlessly with NAT firewalls (unlike IPsec). Don't forget to enable port 1723 for TCP, and protocol 47 (GRE) through your firewall to make it work.

How can one talk about Linux resources without talking about PUTTY? Probably the greatest SSH terminal since the invention of fire. Best of all - its free!

Putty and associated tools can be found on Simon Tatham's web page
Here is a good tutorial explaining how to secure your SSH sessions. Note: SSH is the most common method for script kiddies to break in! Do no use username/password authentication for login!