Receiving UDP broadcast

Question

I have to receive an UDP broadcast (in Ubuntu if that makes any difference). Using Wireshark, I can see the packet being sent from the server machine, and I can see it being rec

Answer 1

To send and receive broadcast

1. Be sure that netmask is correct. in windows mask for broadcast packets does not matters, but not in linux.

2. bind socket to INADDR_ANY

3. setsockopt to BROADCAST

4. call sendto with sendaddr.sin_addr.s_addr = inet_addr("your_interface_broadcast_address"). or - call sento several times for each interface with its broadcast ip address.

5. call recvfrom. any time before calling recvfrom, set up length parameter.

Answer 2

As it turns out my code is perfectly fine, as I thought it would be. There was a problem with the network setup itself.

For posterity, I had set up two static IP'd computers on their own hub, instead of using the built in DHCP server on the server machine to allocate the IP address for the other computer. Pretty localized for my problem but you never know..