接收广播数据包的C#套接字 [英] C# Socket that receives broadcast packets

问题描述

我创建一个套接字并将其绑定到单播地址.但是，它读取发送到广播地址的数据包，我不明白为什么.

I create a socket and bind it to a unicast address. However, it reads packets sent to the broadcast address and I do not understand why.

IPAddress ip;
IPAddress.TryParse("X.X.X.99", out ip);

Socket receiver = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
receiver.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
receiver.Bind(new IPEndPoint(ip, 9999));

byte rcvBuffer = new byte[1500];
int bytesRead = receiver.Receive(rcvBuffer);

使用此代码，我收到的地址同时指向"x.x.x.255:9999"和"x.x.x.99:9999"的数据包，却不明白为什么.有人知道为什么吗?

With this code I receive packets addressed to both "x.x.x.255:9999" and "x.x.x.99:9999" and do not understand why. Anyone know why?

推荐答案

这是广播，而不是多播. x.x.x.255是广播地址.

This is broadcast, not multicast. the x.x.x.255 is a broadcast address.

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