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    <p>In all probability, the first device's use of the terminology "client port" and "server port" do not refer to two different ports within the client device. Instead, the "client port" refers to the port to be used as the point of origin within the first device, and the "server port" refers to the remote destination port on the far device, to which the first device's outgoing traffic will be sent.</p> <p>The second device, on the other hand, is probably fundamentally a "listening" device. It only knows the UDP port it needs to listen on, and waits for any queries destined to that port to arrive from anywhere.</p> <p>So, I will refer to the "first device" as the client, and the "second device" as the server.</p> <p>Each datagram sent from the client to the server contains two sets of address information: 1) The destination IP address and port, and 2) The return IP address and port.</p> <p>The server can use recvfrom() to extract the complete return address (including port number) from each incoming request.</p> <p>This way, we really only need one port number to be predfined and agreed upon by both the server and the client ahead of time: The server's port number.</p> <p>The client could conceivably choose to use any random port number as its origin port (but by convention it would likely choose to avoid any of the well-known reserved ports to avoid potential interoperability problems), and the server could dynamically read the return address information from each incoming request and send its responses to the correct destination dynamically.</p>
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