A high-performance passive DNS monitoring framework that captures, indexes, and analyzes DNS traffic for security and network insights.
dnsmonster is a passive DNS monitoring framework that captures and indexes DNS traffic from network interfaces, pcap files, or dnstap sockets. It helps security and network teams analyze DNS queries for threat detection, performance issues, and traffic trends, with features like IP masking to protect user privacy.
Security analysts, network administrators, and DevOps engineers who need to monitor DNS traffic at scale for threat detection, compliance, or performance optimization in enterprise environments.
Developers choose dnsmonster for its high performance (200k+ queries/second), privacy-aware design with IP masking, and extensive output flexibility—integrating seamlessly with tools like ClickHouse, Splunk, and Elasticsearch without complex dependencies.
Passive DNS Capture and Monitoring Toolkit
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Leverages Linux afpacket and zero-copy techniques to handle over 200,000 DNS queries per second on commodity hardware, as stated in the README.
Includes IP masking (IPv4/IPv6) to enable aggregate trend analysis without tracing queries to individuals, balancing monitoring with user privacy.
Supports modular outputs to ClickHouse, Elasticsearch, Splunk, Kafka, and more, allowing seamless integration into existing security and analytics stacks.
Allows dynamic skip/allow domain lists with hot-reload from files or URLs, enabling real-time noise reduction without restarting the service.
Requires significant configuration for outputs, dependencies like ClickHouse, and network tapping, which can be daunting for quick deployments.
The README warns that versions before 1.x are beta quality with breaking changes, risking data loss or instability in production.
Only provides a Grafana dashboard for ClickHouse; other outputs like Splunk or Elasticsearch lack native dashboards, requiring additional setup.
Some features are OS-dependent, such as syslog output being Linux-only and Windows requiring npcap, limiting cross-platform consistency.