如何唯一地识别不是* VPN连接的网络连接？

Question

I'm trying to track all current network connections at run time, but I want to exclude VPN connections.

I need to be able to identify the network(s) being connected to, as well, so I'm using NetworkListManagerClass() to build a list of current connections:

var manager = new NetworkListManagerClass();
var connectedNetworks = manager.GetNetworks(NLM_ENUM_NETWORK.NLM_ENUM_NETWORK_CONNECTED).Cast<INetwork>();

I believe I can determine if a connection adapter is for a VPN by examining the NetworkInterfaceType of the NetworkInterface class:

NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces().Where(n => n.OperationalStatus == OperationalStatus.Up).ToArray();

      foreach (NetworkInterface n in interfaces)
      {
          if (n.NetworkInterfaceType == NetworkInterfaceType.Tunnel || n.NetworkInterfaceType == NetworkInterfaceType.PPP)
          {

          }
      }

However, it isn't enough for me to just know that an interface is or is not a VPN. I need to be able to track details about the network that the non-VPN interfaces are connected to.

For example:

We'll call my work network "officenetwork". We'll call my home network "homenetwork".

If I'm at work, I can see I'm connected to officenetwork by examining NetworkListManagerClass based off the NLM_ENUM_NETWORK_CONNECTED status. My application should know that officenetwork is my current local network, and will store and reference settings specific to that network.

Similarly, if I'm at home, I should be able to see homenetwork , and store and reference a different set of settings specific to that network.

However, if I'm at home, and I use a VPN to connect to officenetwork , examining NetworkListManagerClass based off the NLM_ENUM_NETWORK_CONNECTED status will show both homenetwork and officenetwork . Since the connection to officenetwork is a VPN, I need to ignore it, and only store and reference the settings for homenetwork .

This software will be for users who will connect to networks I know nothing about, so I cannot assume connection data for specific VPN's or networks.

How can I check current network connections and identify only networks that are not VPN connections, so I can store custom settings for that network?

Answer 1

From an INetwork instance, you can get the list of connections ( INetworkConnections instances) using the GetNetworkConnections method.

Then, using the INetworkConnection::GetAdapterId method , you can get a Guid that represent the adapter Id. The adapter Id in fact matches the NetworkInterface.Id Property (it's a string, but you can convert it to a Guid).

Here is a sample console app that dumps all network and their connections, and interface properties (type, name, etc.):

class Program
{
    static void Main(string[] args)
    {
        var mgr = new NetworkListManager();
        foreach (INetwork network in mgr.GetNetworks(NLM_ENUM_NETWORK.NLM_ENUM_NETWORK_ALL))
        {
            Console.WriteLine("Network: " + network.GetName());
            foreach (INetworkConnection conn in network.GetNetworkConnections())
            {
                Console.WriteLine(" Adapter Id:  " + conn.GetAdapterId());
                var ni = NetworkInterface.GetAllNetworkInterfaces().FirstOrDefault(i => new Guid(i.Id) == conn.GetAdapterId());
                Console.WriteLine(" Interface: " + ni.Name);
                Console.WriteLine(" Type: " + ni.NetworkInterfaceType);
            }
        }
    }
}