SSHGuard VS Diffee

• Log Monitoring
  SSHGuard monitors log files for suspicious activity related to SSH, ensuring that any potential intrusion attempts are detected promptly.
• Automatic Blocking
  It can automatically block IP addresses that show malicious behavior, reducing the risk of repeated attacks from the same source.
• Lightweight
  SSHGuard is lightweight and efficient in terms of resource usage, making it suitable for a variety of server environments.
• Compatibility
  SSHGuard is compatible with multiple log formats and integrates well with existing firewall systems such as iptables and pf.
• Scalability
  It can handle a large number of log entries and is suitable for both small and large server infrastructures.

Possible disadvantages

• Limited Protocol Support
  While SSHGuard is effective for SSH attacks, its support for other protocols is limited compared to more comprehensive security solutions.
• Configuration Complexity
  Initial setup and configuration may be challenging for users unfamiliar with firewall rules and log formats.
• Not a Replacement for Comprehensive Security
  SSHGuard should not be relied upon as the sole security measure; it's best used as part of a layered security strategy.
• False Positives
  There is a potential risk of false positives, which may lead to legitimate IPs being blocked unintentionally.

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• Whats with all the hacking/attacks?

  There are now better defensive tools (I use https://sshguard.net/); not that there are any accounts on this system that are vulnerable, but it does keep the relevant logfile from growing to astronomical size. Source: over 5 years ago

Tracking Diffee since Mar 2021.