Network Monitoring
Wireshark remains the gold standard for packet analysis. Combined with tools like ntopng for flow monitoring and Zeek for network security monitoring, you can gain deep visibility into network traffic.
Vulnerability Scanning
Nessus and OpenVAS are essential for identifying vulnerabilities in your network. Regular scanning helps catch misconfigurations and unpatched systems before attackers do.
Intrusion Detection
Snort and Suricata provide real-time traffic analysis and packet logging. They can detect a wide range of attacks including buffer overflows, stealth port scans, and OS fingerprinting attempts.
Firewall Management
Understanding iptables/nftables on Linux and Windows Firewall with Advanced Security is crucial. Tools like pfSense provide enterprise-grade firewall capabilities for free.
Log Analysis
The ELK Stack (Elasticsearch, Logstash, Kibana) or Grafana with Loki provide powerful log aggregation and analysis capabilities essential for security monitoring.