Socket.MulticastLoopback Property

Gets or sets a value that specifies whether outgoing multicast packets are delivered to the sending application.

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

public bool MulticastLoopback { get; set; }

Property Value

Type: System.Boolean
true if the Socket receives outgoing multicast packets; otherwise, false.

ExceptionCondition
SocketException

An error occurred when attempting to access the socket.

ObjectDisposedException

The Socket has been closed.

Multicast is a scalable method for many-to-many communication on the Internet. A process subscribes to a multicast address; then, any packets sent by a subscribed process are received by every other process subscribed to the multicast address.

Setting this property on a Transmission Control Protocol (TCP) socket will have no effect.

The following code example demonstrates the use of the MulticastLoopback property.

        static void ConfigureUdpSocket(Socket udpSocket)
		{
			// set the Don't Fragment flag.
			udpSocket.DontFragment = true;
			// Enable broadcast.
			udpSocket.EnableBroadcast = true;

			// Disable multicast loopback.
			udpSocket.MulticastLoopback = false;

			Console.WriteLine("Udp Socket configured:");
			Console.WriteLine("  DontFragment {0}", 
                                                udpSocket.DontFragment);
			Console.WriteLine("  EnableBroadcast {0}", 
                                                udpSocket.EnableBroadcast);
			Console.WriteLine("  MulticastLoopback {0}", 
                                                udpSocket.MulticastLoopback);
		}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0
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