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Check NixOS configurations / eval-hosts (pull_request) Successful in 10m31s
Without SNAT on tailscale0, Tailscale drops forwarded packets from LAN source IPs (192.168.2.x) because they are not recognised Tailscale addresses. With networking.nat.externalInterface = "tailscale0", all traffic leaving through the Tailscale tunnel is masqueraded to the router's own Tailscale IP (100.x.x.x), making it indistinguishable from locally-originated traffic. Conntrack handles the return path. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>