Intrusion detection focus area; designed to assist discussion on security related topics, and provides a comprehensive database of security knowledge and resources. It also hosts the BUGTRAQ mailing list.

An excellent source of IDS-related information, including security best practices, audit procedures, penetration testing, community information and more.

Distributed Intrusion Detection System. Submit your own firewall log excerpts or browse through current activity reported to the system. Features a list of the "most wanted" abusive IP addresses.

Large index of computer security resources, including a glossary of Intrusion Detection and Prevention systems.

Comprehensive collection of IDS-related resources made available by the linuxsecurity.com community.

Provides books, articles, software and other information on penetration testing and other security issues. Geared toward Windows NT/2000/XP Network Administrators.

Comprehensive collection of tutorials, product reviews, general information and other resources dealing with Intrusion Detection and Prevention Systems.

Operated by the SANS Institute, the ISC provides a user-supported infrastructure for intrusion detection systems to share information about ongoing attacks that span countries, networks, and administrative boundaries.

An excellent index of most currently available IDS and IPS products, including vendor contact information.

Collection of detailed technical papers on focusing on TCP networks, Intrusion Detection Systems, firewall protection and more.

Extends the capabilities of conventional security systems to help manage threats more efficiently and effectively. Includes a wide array of intrusion detection and analysis tools for Windows servers.