Intrusion Detection Systems (IDS) are essential for maintaining the security of Linux servers. They monitor network or system activities for malicious activities or policy violations and produce reports to a management station. Here are some key points and tools related to IDS:
Network Intrusion Detection Systems (NIDS): Monitor network traffic for suspicious activity.
Host Intrusion Detection Systems (HIDS): Monitor the activities on a single host for suspicious activity.
Snort: An open-source NIDS that performs real-time traffic analysis and packet logging.
Suricata: An open-source NIDS, NIPS, and network security monitoring engine.
OSSEC: An open-source HIDS that performs log analysis, integrity checking, rootkit detection, and more.
AIDE (Advanced Intrusion Detection Environment): A file and directory integrity checker.
Tripwire: A security and data integrity tool useful for monitoring and alerting on specific file changes.
Implementing and maintaining an IDS is a critical component of a comprehensive security strategy for Linux servers.