有没有一种方法可以在Windows上使用Winsock在链接上直接发送以太网数据包？

Question

Is there a way send ethernet packet directly on link using winsock on windows?

I need to broadcast an ethernet packet on a link (ie Destination Mac-Address: Broadcast (ff:ff:ff:ff:ff:ff))

Answer 1

It is not possible to directly access ethernet links. That is a hardware layer that is protected by Windows. To send data out on a specific ethernet adapter, you need to bind() a socket to that adapter's IP address, then you can send() or sendto() your data to a destination IP as needed.

To broadcast a packet, send the data to the bound adapter's subnet broadcast IP address, which you can calculate dynamically by using GetAdaptersInfo() or GetIpAddrTable() to retrieve the adapter's IP address and subnet mask and then OR/AND'ing them together:

BroadcastIP = (IPAddress & SubnetMask) | ~SubnetMask;