Implementing Protective DNS with Technitium DNS Server and MISP Threat Intelligence Integration
By
feldrim
The kind of bagel that ruins lesser bagels for you.
Summary
The article explains how to implement Protective DNS (PDNS) capabilities using Technitium DNS Server integrated with MISP threat intelligence. It details the new v14.2 features including the MISP Connector App for pulling curated threat intelligence and the Log Exporter App with Extended DNS Errors support. The author demonstrates how this setup enables deterministic blocking of malicious domains, provides structured telemetry for SIEM integration, and creates a self-hosted PDNS solution that follows CISA/NCSC guidance while maintaining transparency and control.
Key quotes
· 5 pulledTechnitium DNS Server started as a simple home-lab resolver but has matured into something I'd now place between AdGuard Home and AdGuard Enterprise.
DNS queries appear early in the attack chain, often long before C2 traffic stabilizes. That same idea led agencies like CISA and the NCSC to define what we now call Protective DNS (PDNS).
The recent v14.2 update introduced two changes that finally make PDNS-style filtering realistic: The MISP Connector App, which pulls curated threat intelligence straight from MISP, and updates to the Log Exporter App that add Extended DNS Errors.
When a domain matches the MISP-derived blocklist, Technitium enforces it predictably: NXDOMAIN, for standard blocking; Optional TXT blocking report with an explanatory message; Extended DNS Error, indicating the precise block reason.
The effectiveness of this setup depends far more on the quality of intelligence than on how many feeds you connect. MISP is an enabler, not a magic switch.
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