UDP: Listening to the same port for two different multicast streams

Question

I need to listen to 2 different multicast groups using the same port. Program A will listen from 230.0.0.1 and Program B from 23

Answer 1

If you change

in_addr.sin_addr.s_addr = htonl(INADDR_ANY);

to

inet_aton(, &in_addr.sin_addr.s_addr);

you could have more success.

(And if you change your program to work with getaddrinfo(), you make it future-proof.)