SAMS Teach Yourself Red Hat® Fedora™ 4 Linux® All in One

Summary

In this chapter, you learned some simple yet fundamental techniques to help protect your Linux computer system against network attacks, break-ins, and inadvertent security lapses.

First, you learned to use the Security Level Configuration tool to choose a basic level of software firewalling (also known as packet filtering) for your Linux system. You then learned to create exceptions to the firewalling rules to allow the types of network traffic you need to allow so that you can provide the services you want to provide. You also learned how to enable and disable SELinux, should you feel that your computer is in a vulnerable enough position to require the extra level of assurance that SELinux offers.

Next, you learned about advanced use ...