IsAutomaticPrivateAddressingEnabled Property
Collapse the table of content
Expand the table of content

IPv4InterfaceProperties.IsAutomaticPrivateAddressingEnabled Property

 

Gets a Boolean value that indicates whether this interface has automatic private IP addressing (APIPA) enabled.

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

public abstract bool IsAutomaticPrivateAddressingEnabled { get; }

Property Value

Type: System.Boolean

true if the interface uses APIPA; otherwise, false.

Automatic private IP addressing allows computers that do not have access to a Dynamic Host Configuration Protocol (DHCP) server to be automatically assigned an IP address that does not conflict with public addresses. These addresses are in the range 169.254.0.0 to 169.254.255.255.

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
Available since 2.0
Return to top
Show:
© 2016 Microsoft