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Check NixOS configurations / eval-hosts (pull_request) Failing after 11m52s
exit-node.nix advertised --advertise-exit-node/--advertise-routes but never enabled IP forwarding, so it wouldn't actually route traffic. services.tailscale.useRoutingFeatures = "server" is the built-in way to get the sysctls right without duplicating modules/networking/enable-ip-forwarding.nix. Also opens the firewall for direct (non-DERP-relayed) peer connections, and now imports enable-service.nix instead of duplicating `enable = true`, so "plain tailscale" and "tailscale exit node" are two composable modules. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>