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Intrusion Detection Software

• Snort for Linux
  Snort is an open source network intrusion detection system, capable of performing real-time traffic analysis and packet logging on IP networks. It can perform protocol analysis, content searching/matching and can be used to detect a variety of attacks and probes, such as buffer overflows, stealth port scans, CGI attacks, SMB probes, OS fingerprinting attempts, and much more.
• Snort for Windows
  Snort is an open source network intrusion detection system, capable of performing real-time traffic analysis and packet logging on IP networks. It can perform protocol analysis, content searching/matching and can be used to detect a variety of attacks and probes, such as buffer overflows, stealth port scans, CGI attacks, SMB probes, OS fingerprinting attempts, and much more.
• SnoopNetCop Standard
  SnoopNetCop Standard is a program that can detect possible packet sniffing attack on your network. LAN cards has two oprating modes, 'normal mode' and 'promiscuous mode'.
• AIDE (Advanced Intrusion Detection Environment)
  AIDE (Advanced Intrusion Detection Environment) is a free replacement for Tripwire. It does the same things as the semi-free Tripwire and more.
• Prelude
  Prelude is a new innovative Hybrid Intrusion Detection system designed to be very modular, distributed, rock solid and fast.
• Foundstone Attacker
  A TCP/UDP port listener.
• Foundstone Carbonite
  A Linux Kernel Module to aid in RootKit detection.
• Foundstone Filewatch
  A file change monitor. Used with BlackICE Defender.