Life behind a NAT (Network Address Translator).
The main purpose of this package is to allow a server behind a NAT to accept connections from the public internet.
It uses the following protocols to create a public IP address
It supports the following runtimes
- .NET Framework 4.5
- .NET Standard 2.0
More information is on the Documentation web site.
Published releases are available on NuGet. To install, run the following command in the Package Manager Console.
PM> Install-Package Makaretu.Nat
Or using dotnet
> dotnet add package Makaretu.Nat
Find the NAT(s) and create a public address, LeasedEndPoint.
using Makaretu.Nat;
using System.Net.Sockets;
var endpoints = new List<LeasedEndpoint>();
foreach (var nat in NatDiscovery.GetNats())
{
var lease = await nat.CreatePublicEndpointAsync(ProtocolType.Tcp, 8080);
var endpoint = new LeasedEndpoint(lease);
endpoints.Add(endpoint);
Console.WriteLine($"Public address {endpoint}");
}
// Do your work.
foreach (var endpoint in endpoints)
{
endpoint.Dispose();
}The natcheck tool is available on Nuget and
is installed with dotnet.
> dotnet tool install --global natcheck
natcheck is a tool to examine the environment and display the network settings.
natcheck
Check your NAT(s)
Unicast addresses
169.254.253.248 is public False
192.168.178.21 is public False
fe80::8891:f4b8:3f8:fdf8%10 is public False
2406:e001:xxxx:f601:7573:b0a8:46b0:xxxx is public True
2406:e001:xxxx:f601:49f5:3a68:e240:xxxx is public True
fe80::7573:xxxx:46b0:xxxx%11 is public False
Gateways
fe80::3a10:d5ff:fe09:1c0e%11
supports NAT-PCP False
supports NAT-PMP False
192.168.178.1
supports NAT-PCP True
supports NAT-PMP False
Nats
192.168.178.1:5351 fritz.box
Public endpoint 165.84.19.45:8080