Open source software is such an integral part of the Internet that is it safe to say that theInternet wouldn’t exist as we know it today without it. The Internet never would havegrown as fast and as dynamically as it did without open source programs such as BIND,which controls the domain name system; Sendmail, which powers most e-mail servers;INN, which runs many news servers; Major Domo, which runs many of the thousands ofmailing lists on the Internet; and of course the popular Apache Web server. One thing forsure is that the Internet is a lot cheaper due to open source software. For that, you canthank the Free Software Foundation, BSD UNIX, Linux and Linus Torvalds, and the thou-sands of nameless programmers who put their hard work and sweat into the programs thatrun today’s Internet. While open source programs cover just about every aspect of computer software—from complete operating systems and games to word processors and databases—this bookprimarily deals with tools used in computer security. In the security field, there are pro-grams that address every possible angle of IT security. There are open source firewalls,intrusion detection systems, vulnerability scanners, forensic tools, and cutting-edge pro-grams for areas such as wireless communications. There are usually multiple choices ineach category of mature, stable programs that compare favorably with commercial prod-ucts. I have tried to choose the best of breed in each major area of information security (inmy opinion, of course!). I present them in a detailed manner, showing you not just how toinstall and run them but also how to use them in your everyday work to have a more securenetwork. Using the open source software described in this book, you can secure yourenterprise from both internal and external security threats with a minimal cost and maxi-mum benefit for both the company and you personally.
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