仅从特定适配器（例如 192.168.101.1）发送 UDP 广播（255.255.255.255）；在 Windows 上
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Send UDP broadcast (255.255.255.255) from specific adapter (e.g. 192.168.101.1) only; on Windows
提问by nietras
Solution for Windows XP or higher. Preferably in C# or else in C++.
Windows XP 或更高版本的解决方案。最好使用 C# 或 C++。
We do not want to broadcast using a subnet directed broadcast (e.g. 192.168.101.255) since the device we are trying to contact is not responding to this. Instead, we want to be able to send UDP datagram with a destination of 255.255.255.255 from a specific NIC/IPAddress only, such that the broadcast is NOT send out on other NICs.
我们不想使用子网定向广播（例如 192.168.101.255）进行广播，因为我们尝试联系的设备没有对此做出响应。相反，我们希望能够仅从特定的 NIC/IPAddress 发送目的地为 255.255.255.255 的 UDP 数据报，这样广播就不会在其他 NIC 上发送。
This means we have to circumvent the IP stack, which is, thus, the question. How can we circumvent the IP stack on windows to send a UDP/IP compliant datagram from a specific NIC/MAC address only?
这意味着我们必须绕过 IP 堆栈，这就是问题所在。我们如何绕过 Windows 上的 IP 堆栈以仅从特定的 NIC/MAC 地址发送符合 UDP/IP 的数据报？
回答by Chris Becke
Just bind() the socket to the desired interface instead of using INADDR_ANY ?
只需将套接字绑定（）到所需的接口而不是使用 INADDR_ANY ？
// Make a UDP socket
SOCKET s = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
// Bind it to a particular interface
sockaddr_in name={0};
name.sin_family = AF_INET;
name.sin_addr.s_addr = inet_addr("192.168.101.3"); // whatever the ip address of the NIC is.
name.sin_port = htons(PORT);
bind(s,(sockaddr*)name);
回答by brickner
回答by Erich Mirabal
I've not tried this, but I know that WinPCap allows you to do a raw send. Since it works at a pretty low level, it might allow you to send low enough on the stack to bypass the full broadcast. There are various C# wrappers out there, and of course you can use the normal C/C++ code available out there. I think the trick might be to bind to the right adapter you want to send out of and it might just work.
我没有试过这个，但我知道 WinPCap 允许你做一个原始的send。由于它在相当低的级别上工作，因此它可能允许您在堆栈上发送足够低的数据以绕过完整广播。那里有各种 C# 包装器，当然您可以使用那里可用的普通 C/C++ 代码。我认为诀窍可能是绑定到您想要发送出去的正确适配器，它可能会起作用。
回答by JimB
The broadcast address 255.255.255.255 is too general.You have to craft a different broadcast address for each network interface separately.
广播地址 255.255.255.255 太笼统了。您必须分别为每个网络接口制作不同的广播地址。
