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With the WiFi radio off, the default route moved to wwan0 within 10 s and all IPv4/DNS/Tailscale samples passed. Tailscale went direct to halogen over povo's global IPv6 (no DERP), and an SSH session over the tailnet survived both switches. WiFi took back IPv4 within 15 s and IPv6 within ~45 s. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>