Multicasting only works on same machine (urgent)

[MadSkyrim]

I am making client and a server program. The server pulses out a packet of information and the client is supposed to receive it. This works fine so long as the programs are running on the same machine. I need it to work on any machine in a given network. There is certainly nothing wrong with the network. This means that the problem lies entirely in my code. This is odd however as I had everything working perfectly a couple of days ago and haven't changed anything in terms of the multicasting implementation. Here are the relevant pieces of code that I have for each program.

Client : Reciever

sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  
if((result = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val))) < 0){
    perror("setsockopt() failure");
    exit(1);
}

if((result = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val))) < 0){
    perror("setsockopt() failure");
    exit(1);
}

memset(&multicastAddr, 0, sizeof(multicastAddr));   /* Zero out structure */
        multicastAddr.sin_family = AF_INET;                 /* Internet address family */
        multicastAddr.sin_addr.s_addr = htonl(INADDR_ANY);/* Multicast IP address */
        multicastAddr.sin_port = htons(current->port);         /* Multicast port */
 
        memset(&mreq, 0, sizeof(mreq));   /* Zero out structure */
        mreq.imr_multiaddr.s_addr = inet_addr(current->address); /* multicast group */
        mreq.imr_interface.s_addr = htonl(INADDR_ANY); /* local inferface */

        /* join the multicast group */
        if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
            (void *)&mreq, sizeof(mreq)) < 0){
            perror("setsockopt() failure");
            exit(1);
        }

        if (bind(sock, (struct sockaddr *)&multicastAddr, sizeof(multicastAddr)) < 0)
        {
            perror("bind() failure");
            exit(1);
        }

        nread = recvfrom(sock, buffer, sizeof(buffer), 0, NULL, 0);
        if (nread <= 0) {
            close(sock);
            printf("client on descriptor #%i disconnected\n", sock);
        }

Server : Multicaster

/* Construct local address structure */
    memset(&multicastAddr, 0, sizeof(multicastAddr));   /* Zero out structure */
    multicastAddr.sin_family = AF_INET;                 /* Internet address family */
    multicastAddr.sin_addr.s_addr = inet_addr(address);/* Multicast IP address */
    multicastAddr.sin_port = htons(retrieveport(&packet[4]));         /* Multicast port */
    
    /* Create socket for sending/receiving datagrams */
    if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
        perror("socket() failure");
        
    /* Set TTL of multicast packet */
    if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_TTL, (void *) &multicastTTL, 
          sizeof(multicastTTL)) < 0)
        perror("setsockopt() failure");

    for (;;) /* Run forever */
    {
        /* Multicast sendString in datagram to clients every few seconds */
        if (sendto(sock, packet, packetLen, 0, (struct sockaddr *) 
              &multicastAddr, sizeof(multicastAddr)) != packetLen)
            perror("sendto() sent a different number of bytes than expected");
        usleep(pulse * 1000);
    }

Any ideas?