通过同一套接字的UDP广播和单播？ [英] UDP broadcast and unicast through the same socket?

问题描述

我有一个Linux应用程序，该应用程序打开UDP套接字并将其绑定到端口。通过套接字发送单播数据包，我没有任何问题。我本来有机会发送广播数据包，所以我启用了SO_BROADCAST，它允许广播数据包通过，但是后来我注意到单播数据包也正在广播。这是UDP套接字的预期行为，还是我配置错误的可能性更大？

I have a Linux application that opens a UDP socket and binds it to a port. I haven't had any problem sending unicast packets through the socket. I had occasion to send a broadcast packet, so I enabled SO_BROADCAST, which allowed the broadcast packets to pass, but then I noticed that the unicast packets were being broadcast as well. Is this expected behaviour for a UDP socket, or is it more likely that I've misconfigured something?

推荐答案

据我了解 SO_BROADCAST 是一个套接字选项。因此，如果您在套接字上启用它，则此套接字将广播。我想如果要从同一代码进行单播和广播，则需要打开不同的套接字。

From what I understand SO_BROADCAST is a socket option. So if you enable it on your socket this socket will broadcast. I guess you will need to open different sockets if you want to do unicast and broadcast from the same code.

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