But in this age of widespread virus infections, worms, and digital attacks, no one can afford to ignore the network defenses. Written by IT managers rush in mind, the Open Source Security Tools is a practical, hands-on introduction to open source security tools. For each security task described, the author reviews the best open source tools and how to use and also provides case studies and sample implementations. Covered tasks include: Installing an open source firewall using ipchains, iptables, firewall Turtle, or SmoothwallScanning ports and testing for vulnerabilities using Nmap, Nlog, Nmap for Windows, Nessus, and NessusWXUsing sniffer and network-intrusion systems, including tcpdump, Ethereal, Windump, Snort?, And Snort? Whether you re a Windows system administrator or network administrator?, You will come away with an understanding of how open source security tools can help protect your organization and further your own career.