{pkgs
,config
,lib
,...}: {
  environment.systemPackages = [pkgs.tailscale];
  services.tailscale.enable = true;

  systemd.services.tailscale-autoconnect = {
    description = "Automatically connects to Tailscale";

    # make sure tailscale is running before trying to connect to tailscale
    after = [ "network-pre.target" "tailscale.service" ];
    wants = [ "network-pre.target" "tailscale.service" ];
    wantedBy = [ "multi-user.target" ];

    # set this service as a oneshot job
    serviceConfig.Type = "oneshot";

    # have the job run this shell script
    script = ''
      # wait for tailscaled to settle
      sleep 2
      # check if we are already authenticated to tailscale
      status="$(${pkgs.tailscale}/bin/tailscale status -json | ${pkgs.jq}/bin/jq -r .BackendState)"
      if [ $status = "Running" ]; then # if so, then do nothing
        exit 0
      fi

      # ${pkgs.tailscale}/bin/tailscale up # blocks, doesn't give url
      # This time, configure device auth so that we authenticate from portal
      # https://tailscale.com/kb/1099/device-authorization/#enable-device-authorization-for-your-network 
      ${pkgs.tailscale}/bin/tailscale up -authkey tskey-auth-kJcgTG5CNTRL-PUVFkk31z1bThHpfq3FC5b1jcMmkW2EYW
    '';
  };

  networking.firewall = lib.mkIf config.networking.firewall.enable {
    trustedInterfaces = [
      "tailscale0"
    ];
    allowedUDPPorts = [
      config.services.tailscale.port
    ];
    allowedTCPPorts = [
      22
    ];
    checkReversePath = "loose";
  };
}