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IPv4InterfaceProperties.IsForwardingEnabled Property

Gets a Boolean value that indicates whether this interface can forward (route) packets.

Namespace:  System.Net.NetworkInformation
Assemblies:   System (in System.dll)
  System.Net.NetworkInformation (in System.Net.NetworkInformation.dll)

public abstract bool IsForwardingEnabled { get; }

Property Value

Type: System.Boolean
true if this interface routes packets; otherwise false.

If routing is disabled, packets that are received by the interface with a destination address that is not held by the interface are discarded.

The following code example gets an IPv4InterfaceProperties object and displays its data.

public static void DisplayIPv4NetworkInterfaces()
{
    NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
    IPGlobalProperties properties = IPGlobalProperties.GetIPGlobalProperties();
    Console.WriteLine("IPv4 interface information for {0}.{1}",
       properties.HostName, properties.DomainName);
    Console.WriteLine();   

    foreach (NetworkInterface adapter in nics)
    {
        // Only display informatin for interfaces that support IPv4. 
        if (adapter.Supports(NetworkInterfaceComponent.IPv4) == false)
        {
            continue;
        }
        Console.WriteLine(adapter.Description);
        // Underline the description.
        Console.WriteLine(String.Empty.PadLeft(adapter.Description.Length,'='));
        IPInterfaceProperties adapterProperties = adapter.GetIPProperties();
        // Try to get the IPv4 interface properties.
        IPv4InterfaceProperties p = adapterProperties.GetIPv4Properties();

        if (p == null)
        {
            Console.WriteLine("No IPv4 information is available for this interface.");
            Console.WriteLine();
            continue;
        }
        // Display the IPv4 specific data.
        Console.WriteLine("  Index ............................. : {0}", p.Index);
        Console.WriteLine("  MTU ............................... : {0}", p.Mtu);
        Console.WriteLine("  APIPA active....................... : {0}", 
            p.IsAutomaticPrivateAddressingActive);
        Console.WriteLine("  APIPA enabled...................... : {0}", 
            p.IsAutomaticPrivateAddressingEnabled);
        Console.WriteLine("  Forwarding enabled................. : {0}", 
            p.IsForwardingEnabled);
        Console.WriteLine("  Uses WINS ......................... : {0}", 
            p.UsesWins);
        Console.WriteLine();
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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