Tailscale Premium: DERP relay traffic surge

Identifies when a source node has more than 75 percent of its recent flows falling back to a DERP relay (Tailscale IsRelayed flag, traffic via 127.3.3.40). Operational signal useful for spotting policy drift.

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: DERP relay traffic surge

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules