如何监听任意端口的广播包？

使用.NET，如何在任何端口上侦听发送到.255的udp广播数据包，而不需要绑定到特定端口？

我自己找到了办法。它是这样工作的：

mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);
mainSocket.Bind(new IPEndPoint(IPAddress.Parse("192.168.0.1"), 0));
mainSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, true);                           

byte[] byTrue = new byte[4] { 1, 0, 0, 0 };
byte[] byOut = new byte[4] { 1, 0, 0, 0 }; 

// Socket.IOControl is analogous to the WSAIoctl method of Winsock 2
mainSocket.IOControl(IOControlCode.ReceiveAll, //Equivalent to SIO_RCVALL constant of Winsock 2
    byTrue,
    byOut);

//Start receiving the packets asynchronously
mainSocket.BeginReceive(byteData,0,byteData.Length,SocketFlags.None,new AsyncCallback(OnReceive),null);

在异步处理程序中，我执行 mainSocket.EndReceive(...)，解析数据并根据需要启动新的 BeginReceive（从多线程接收器外部控制）。

奇迹般有效。致谢 Hitesh Sharma (http://www.codeproject.com/KB/IP/CSNetworkSniffer.aspx http://www.codeproject.com/KB/IP/CSNetworkSniffer.aspx)