The following code receive only UDP multicast in my subnet. How I can receive UDP multicast from all subnets?
sd = socket(AF_INET, SOCK_DGRAM, 0);
int reuse = 1;
setsockopt(sd, SOL_SOCKET, SO_REUSEADDR,
(char *) &reuse, sizeof(reuse));
memset((char *) &localSock, 0, sizeof(localSock));
localSock.sin_family = AF_INET;
localSock.sin_port = htons(1900);
localSock.sin_addr.s_addr = INADDR_BROADCAST;
bind(sd, (struct sockaddr*) &localSock, sizeof(localSock));
group.imr_multiaddr.s_addr = inet_addr("239.255.255.250");
group.imr_interface.s_addr = inet_addr("192.168.3.2");
setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
(char *) &group, sizeof(group));
/* Read from the socket. */
You need to join the group via all interfaces, not just 192.168.3.2.
You also need to bind your socket to INADDR_ANY, not INADDR_BROADCAST.
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