How do i enable multicast in LINUX/JDS?

hello all,
as soon as i execute this code i get "NoSuchDevice" error only in linux/jds and it works perfectly on windows..
MulticastSocket ms = null;
            try
                ms = new MulticastSocket ();
                ms.joinGroup (ia);
                ms.send (dp);
                System.out.println ("Multicast.multicastSend:"+transmit);
            catch (SocketException ex)
                System.err.println (ex);
            catch (IOException ex)
                System.err.println (ex);
            }             i ran the same code in SuSe 9.3 also;same error here also;
i also executed this command "#iptables -F" and "#ifconfig eth0 MULTICAST -allmulti".its not working help me please by enumerating the all the steps completely to make multicast work.
thanks

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