Lost.PortForwarding 0.3.0-a5

This is a prerelease version of Lost.PortForwarding.
dotnet add package Lost.PortForwarding --version 0.3.0-a5                
NuGet\Install-Package Lost.PortForwarding -Version 0.3.0-a5                
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Lost.PortForwarding" Version="0.3.0-a5" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Lost.PortForwarding --version 0.3.0-a5                
#r "nuget: Lost.PortForwarding, 0.3.0-a5"                
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Lost.PortForwarding as a Cake Addin
#addin nuget:?package=Lost.PortForwarding&version=0.3.0-a5&prerelease

// Install Lost.PortForwarding as a Cake Tool
#tool nuget:?package=Lost.PortForwarding&version=0.3.0-a5&prerelease                




Lost.PortForwarding is a lightweight and easy-to-use class library to allow port forwarding in NAT devices that support UPNP (Universal Plug & Play) and/or PMP (Port Mapping Protocol).


NATed computers cannot be reached from outside and this is particularly painful for peer-to-peer or friend-to-friend software. The main goal is to simplify communication amoung computers behind NAT devices that support UPNP and/or PMP providing a clean and easy interface to get the external IP address and map ports and helping you to achieve peer-to-peer communication.

  • Tested with .NET YES
  • Tested with Mono YES

How to use?

With nuget :

Install-Package Lost.PortForwarding

Go on the nuget website for more information.


The simplest scenario:

var discoverer = new NatDiscoverer();
var device = await discoverer.DiscoverDeviceAsync();
var ip = await device.GetExternalIPAsync();
Console.WriteLine("The external IP Address is: {0} ", ip);

The following piece of code shows a common scenario: It starts the discovery process for a NAT-UPNP device and onces discovered it creates a port mapping. If no device is found before ten seconds, it fails with NatDeviceNotFoundException.

var discoverer = new NatDiscoverer();
var cts = new CancellationTokenSource(10000);
var device = await discoverer.DiscoverDeviceAsync(PortMapper.Upnp, cts);

await device.CreatePortMapAsync(new Mapping(Protocol.Tcp, 1600, 1700, "The mapping name"));

For more info please check the Wiki



Lost.PortForwarding is been developed by Lucas Ontivero (@lontivero). You are welcome to contribute code. You can send code both as a patch or a GitHub pull request.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.
  • .NETStandard 2.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
0.3.0-a5 58 6/10/2024
0.2.1 84 6/10/2024