Wazuh vs Security Onion: which monitoring problem are you solving?

Wazuh planning centres on agent populations, manager and indexer services, endpoint enrollment, and host-to-service paths. Security Onion planning centres on sensor placement, mirrored or tapped traffic, capture capacity, storage, and access to network-derived telemetry. A switched network does not automatically expose the traffic a sensor needs.

The operating burden follows those choices. Agents need endpoint deployment and lifecycle management. Sensors need physical or virtual placement, traffic engineering, storage, and visibility-gap review.

Use MITRE ATT&CK as a language for behaviours and coverage, not as proof that a product detects every technique. Map an investigation from alert to evidence. An analyst may begin with a suspicious host event in Wazuh, then need network evidence from Security Onion; or begin with a network alert and need endpoint context to confirm process activity.

Define joins between tools: timestamp conventions, asset identifiers, user identifiers, retained fields, access roles, and escalation. Without them, two data sources become two isolated consoles.

Choose Wazuh first when the immediate gap is managed endpoint telemetry and agent-driven security workflows. Choose Security Onion first when the immediate gap is monitored network segments and traffic-derived investigation. Choose a combined design only when owners can operate both paths and analysts have a documented way to pivot.

For an illustrative remote-workforce environment with little central traffic visibility, endpoint telemetry may provide more immediate coverage. For a datacentre segment with critical east-west traffic, sensor placement may be the first architectural problem.