在所有NIC上使用IPv4和IPv6广播UDP消息

Question

我正在编写几个函数来允许我使用IPv4和IPv6发送UDP广播/多播。以下代码执行此操作。我遇到的问题是它只对单个适配器执行此操作。如果我的电脑上安装了两个网络适配器，则它不会同时发送广播。是否可以配置单个套接字来处理IPv4和IPv6以及在所有NIC上发送和接收？或者我必须为每个IP地址创建单独的套接字？

public void CreateBroadcaster(CancellationToken cancellationToken, int discoveryPort, int advancePort) 
    { 
     _cancellationToken = cancellationToken; 

     _broadcastEndpoint = new IPEndPoint(IPAddress.Broadcast, advancePort); 

     var epLocal = new IPEndPoint(IPAddress.IPv6Any, discoveryPort); 

     _broadcaster = new UdpClient(epLocal); 

     var soc = new Socket(AddressFamily.InterNetworkV6, SocketType.Dgram, ProtocolType.Udp); 
     soc.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, false); 

     _broadcaster.Client = soc; 

     _broadcaster.Client.DualMode = true; 

     _broadcaster.Client.Bind(epLocal); 

     _broadcaster.EnableBroadcast = true; 
     _broadcaster.MulticastLoopback = true; 

     _broadcaster.Client.SetSocketOption(
      SocketOptionLevel.IPv6, 
      SocketOptionName.AddMembership, 
      new IPv6MulticastOption(IPAddress.Parse("ff02::1"))); 
    } 

    public void SendPingsOnAdapterLocalSubnets() 
    { 
     _broadcaster.Send(_sendData, _sendData.Length, _broadcastEndpoint); 
    } 

Answer 1

您需要2个独立的套接字。在低级别上，sockaddr结构体将有一个或另一个。 IPv4（AF_INET）或IPv6（AF_INET6）。

http://www.gnu.org/software/libc/manual/html_node/Address-Formats.html#Address-Formats