Send network broadcast message without specified broadcast port

Hi,

Can anyone help me to resolve this problem.

I'm using the LLAPI to create a server framework. There are servers(master, world, gateway) will found each other by the broadcasting message. but i have a problem on the broadcast API from NetworkTransport. it's needs to specified a broadcast port, and the client must listening to the same port to receive the broadcasting message. because this issue so, we just can run only one server to listen on this broadcast port in a machine.

Thanks