How to detect other hosts on LAN messenger using a single UDP port?

Question

As stated in the IP Messenger Help , it uses a UDP Port 2425 to detect other hosts. How does it actually achieves it with a single port??

How do I proceed to achieve this, like say create a socket, then broadcast and all the steps.

Any Ideas and Help would be greatly appreciated..

Answer 1

1. Create datagram socket()
2. bind() the port
3. prepare packet
4. sendto() UDP packet to the broadcast (mulicast) address
5. recvfrom() as many answer as you want