Tailscale Premium: Devices with persistent DERP relay usage

Identifies devices that have consistently fallen back to DERP relay (IsRelayed=true) over the past 24 hours. Sustained relay usage points to NAT/firewall misconfiguration or deliberate evasion.

Detection logic

Detection requirements

Platform: ESXi Linux macOS Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: tailscalepremiumccf
Log source service: tailscale_network_cl

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Detection rules

Tailscale Premium: Devices with persistent DERP relay usage

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules