Properly-configured firewalls are mandatory in today's hostile Internet
Misconfigured firewalls can keep customers from reaching your web site and sending you email. The most highly-publicized example of this was on January 23, 2001 when Microsoft's entire Internet site was down for over a day due to their misconfigured firewall. Why it took over a day to recover from this is a mystery. Reconfiguring a firewall takes a few minutes if you possess the right knowledge.
This course will focus on the packet filtering firewall that's built-in to the Linux kernel. The Linux kernel is extremely stable and, properly configured, highly resistant to attack - characteristics that you want in a firewall. Today, anyone can deploy a firewall at little or no cost since Linux is free.
This course will focus on how you configure the Linux firewall by writing rules directly using command line tools and plain text files. However, we'll show you scripted and graphical tools that you can use as well.
This course will bring you up to speed on firewall concepts quickly. You'll understand the issues and minimize your risk of attack.