var dictionary = new RadiusDictionary(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + "\\radius.dictionary"); var cert = new X509Certificate("clientCertificatePath", "certificatePassword"); var client = new RadSecClient(dictionary, cert); var packet = new RadiusPacket(PacketCode.AccessRequest, 0, "xyzzy5461"); packet.AddAttribute("User-Name", "nemo"); packet.AddAttribute("User-Password", "arctangent"); packet.AddAttribute("NAS-IP-Address", IPAddress.Parse("192.168.1.16")); packet.AddAttribute("NAS-Port", 3); var responsePacket = await client.SendPacketAsync(packet, new IPEndPoint(IPAddress.Parse("127.0.0.1"), 2083)); Console.WriteLine(responsePacket.Code);