A step-by-step guide to bulding a commercial-grade firewall with open source software Building Linux and OpenBSD Firewalls Its now more important than ever before to protect your data and computers from people trying to hack into your network. Without the proper security, the wrong person can gain access to your system and read critical documents, change data, delete items, and much worse. With this book, you'll quickly learn how to protect your network from such attacks as you build a Linux or OpenBSD firewall. From determining how much security you'll need to configuring the firewall and monitoring your system, authors Tom Yates and Wes Sonnenreich clearly guide you through all the necessary steps to improve your security. They show you how to: Build Linux and OpenBSD firewalls that meet your security needs Choose the appropriate hardware for each operating system and put the machine together Configure a firewall that allows network services such as email, newsgroups, and Internet and intranet access Monitor and update your system to close any holes in security Detect intruders and restore your network security The companion Web site at www wiley.com/compbooks/sonnenreich features: Updates for the most recent releases of OpenBSD and Red Hat Useful scripts and tools Sample firewall configurations Additional online resources