Send UDP broadcast on Windows 7

Question

I have a PC with two network cards connected to different networks (multi homed network setup). I want to send UDP broadcast frames on both networks. The senders IP address

Answer 1

Can't you just open two normal UDP sockets and bind one to each of the interface addresses and then simply send to the broadcast addresses ?

This will, as far as I know, deal with the sending on both networks and it will ensure that the packets sent will have the correct ip address. It wont work if you bind a single socket to INADDR_ANY which, of course, WILL work if there's only a single network adapter in the machine. To create a complete solution it's probably best to iterate over the available addresses and create a socket for each, bind to each and send from each.