reNixos/s0mev1rtn0de-nix/networking/firewall/wt0.nix

{...}: {
  networking = {
    firewall = {
      interfaces = {
        wt0 = {
          allowedUDPPorts = [
            39856
          ];

          allowedTCPPorts = [
            39856
          ];
        };
      };
    };
  };
}