Gain real-time visibility into network activity with monitoring tools and threat detection to identify incidents early and respond quickly.
Orion IT Service Team
May 30, 2026
You can't protect what you can't see. Network monitoring provides visibility into what's happening on your network—who's connecting, where they're connecting from, what they're accessing, and what traffic patterns are normal. Network threat detection identifies suspicious activity that indicates compromise, attacks, or policy violations. Together, monitoring and detection enable rapid incident response and threat hunting.
Effective network monitoring combines flow analysis, packet inspection, and behavioral analytics to detect threats.
Network flow analysis examines communication patterns—who's talking to whom, how much data is being transferred, and what protocols are being used. Flow data from routers, switches, and firewalls is aggregated and analyzed. Flows reveal normal network patterns and abnormalities that might indicate threats.
Flow analysis is lightweight compared to packet inspection and can process high volumes of traffic without overwhelming systems. NetFlow and sFlow are common flow export protocols used by network devices.
Security Information and Event Management (SIEM) systems aggregate logs from firewalls, routers, switches, servers, and security appliances. Centralized logs provide complete visibility into infrastructure. SIEM systems correlate events from multiple sources to detect attack patterns. For example, multiple failed login attempts followed by successful login from unusual location might indicate account compromise.
SIEM provides alerting on suspicious patterns, dashboards for security monitoring, and forensics capabilities for incident investigation.
Signature-based detection identifies known attacks by comparing traffic against signatures of known threats. Behavior-based detection identifies unusual activity that deviates from normal patterns. Anomaly detection uses machine learning to build profiles of normal behavior and detect deviations.
Effective threat detection combines multiple techniques. Signature detection catches known threats quickly. Behavior and anomaly detection catch unknown threats and insider threats.
Monitor north-south traffic (traffic entering/leaving network) for external attacks and data exfiltration. Monitor east-west traffic (internal communication) for lateral movement and internal threats. Monitor encrypted traffic volume even if you can't inspect contents. Monitor DNS queries for malware command-and-control communication and data exfiltration. Monitor protocol anomalies—unusual protocols, unusual ports, protocol combinations that are suspicious.
Network monitoring enables rapid incident response. When suspicious activity is detected, investigate using network data—what systems are involved, what data is at risk, what's the attack pattern. Threat hunting proactively searches for threats using network monitoring. Hunt for known attack patterns, unusual protocol usage, suspicious data transfers, and behavioral anomalies.
Maintain network data for investigation and forensics. Some organizations keep raw packet captures for 30-90 days, flow data for 1-2 years, and aggregated statistics indefinitely.
Key Takeaway
Network monitoring combined with threat detection provides visibility into infrastructure, enables rapid incident detection and response, and supports threat hunting to discover threats before damage occurs.
Implement Network Monitoring