How to get current used network adapter

Question

Now I am trying to get network adapter in use among of several network adapters on my machine so that I can get ip address, mac address and adapter name of the network adapter. But I am not having any luck. What I found the solution for it is Get current network adapter in use. I dont think it is for .Net framework project but ASP.NET Core.

My code is below.

public void GetIpAndMacAddress()
{
    foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
    {
        // Only consider Ethernet network interfaces
        if (nic.NetworkInterfaceType == NetworkInterfaceType.Ethernet &&
            nic.OperationalStatus == OperationalStatus.Up)
        {
            IPInterfaceProperties adapterProperties = nic.GetIPProperties();
            foreach (var ip in adapterProperties.UnicastAddresses) 
            {
                if (ip.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                    IPAddress = ip.Address.ToString();
            }
            string hexMac = nic.GetPhysicalAddress().ToString(),
                   regex = "(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})",
                   replace = "$1:$2:$3:$4:$5:$6";
            IPv4InterfaceProperties p = adapterProperties.GetIPv4Properties();

            netAdapterName = nic.Name;
            MACAddress = Regex.Replace(hexMac, regex, replace);
            return;
        }
    }
}

@John_ReinstateMonica, thanks for your interests, it means that the current used network adapter I am using to connect to internet. — JS Guru, Dec 04 '19 at 09:07

Anu Viswan · Accepted Answer · 2019-12-04T09:14:40.093

5

Following should help you.

NetworkInterface[] networks = NetworkInterface.GetAllNetworkInterfaces();

var activeAdapter = networks.First(x=> x.NetworkInterfaceType != NetworkInterfaceType.Loopback
                    && x.NetworkInterfaceType != NetworkInterfaceType.Tunnel
                    && x.OperationalStatus == OperationalStatus.Up 
                    && x.Name.StartsWith("vEthernet") == false);

The search is based on eliminating Network Adapters that are neither Loopback (Commonly used for testing) or Tunnel(commonly used for secure connection between private networks). Operational Status ensures that the Network interface is up and is is able to transmit data packets. The "vEthernet" is naming convention commonly used by Windows for Hyper-V Virtual Network Adapters

edited Dec 04 '19 at 09:14

answered Dec 04 '19 at 08:16

Anu Viswan

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Thanks for your reply, I will check it and will let you know – JS Guru Dec 04 '19 at 08:39
I think it is what I wanted, Could you explain more about search terms? – JS Guru Dec 04 '19 at 08:55
@JSGuru I have updated the answer with brief description .Hope that helped – Anu Viswan Dec 04 '19 at 14:25
1

Hi Anu Viswan, I appreciated your help. – JS Guru Dec 04 '19 at 15:04

How to get current used network adapter

1 Answers1