Fortigate DHCP Monitor

A focused tool to monitor FortiGate DHCP activity for network admins, ensuring lease availability, address usage, and alerting on anomalies.

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100%

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4.9 / 5.0

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About This Tool

Fortigate DHCP Monitor provides real-time visibility into FortiGate DHCP activity, including lease counts, pool usage, and expirations. It centralizes data for admins to verify address utilization, detect exhausted pools, and identify unusual lease churn without device changes. Data sources include FortiGate API endpoints and optional syslog streams, with time-series storage to support historical analysis. This enables proactive capacity planning and rapid investigations when DHCP behavior deviates from baseline.
Core capabilities include per-device and per-scope metrics, multi-device aggregation, threshold-based alerts, and exportable reports. Outputs are designed for integration with SIEMs and reporting pipelines, while maintaining data integrity through consistent timestamps (UTC) and standardized units (counts, percentages). The tool emphasizes reliability, auditability, and operational efficiency for large campuses, retail networks, and MSPs.
Beneficiaries are network operations teams, cloud/on-prem admins, MSPs, and auditors who require verifiable DHCP visibility. Its value lies in tight FortiGate API integration, deterministic thresholds, and stable time-series data, reducing firefighting during peak usage and simplifying compliance reporting.

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How to Use

Provide inputs: device_ip, api_token, and optional scope_filter and collection_interval_sec.
Configure thresholds and filters for per-scope or per-device monitoring.
Initiate data collection or schedule periodic polling aligned with your maintenance window.
Review outputs (summary, per-interface, and trends) and export if needed.
Set alerts and review historical patterns to plan capacity and respond to anomalies.

Frequently Asked Questions

Find Quick Answers

What data sources does the tool use?

The tool queries FortiGate DHCP data via the device API and can ingest optional syslog events. If the API is temporarily unavailable, cached data or partial results are returned with alerts indicating collection gaps, ensuring continued visibility wherever possible.

Can it monitor multiple FortiGate devices?

Yes. The tool supports multi-device aggregation, producing both per-device outputs and a consolidated view. You can filter by device, scope, or interface and export combined data for cross-device capacity planning.

What happens when a pool is exhausted?

An alert is emitted when in_use approaches or reaches total_leases and free leases fall below the configured threshold. The system logs the event and includes it in the active alerts list, enabling timely remediation and reporting.

Can the results be exported for other tools?

Yes. Outputs are available in JSON or CSV formats to integrate with SIEM, ticketing, or reporting systems, enabling automated workflows and audit-ready documentation.

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