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- 04-10-2009, 07:31 AM #1Senior Member
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- Jan 2009
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Multicast group seems to be a noop
I have written an application which uses multicast so that portions of the application can find eachother on a network without the need for a bunch of preconfiguration. The problem I'm seeing, is that the reciver code receives the Datagram packets for every group, rather than just the one it's joined. I'm using java 6_10.
Here's the notional snippet from the sender:
MulticastSocket s = new MulticastSocket(); byte buf = ... (my data buffer) // Group is 220.127.116.11 for one sender, and 18.104.22.168 for another // port = 64000 in both cases, although, sender does not need // to join the group DatagramPacket pack = new DatagramPacket(buf, buf.length, InetAddress.getByName(group), port); s.send(pack); s.close();
MulticastSocket s = new MulticastSocket(port); //port = 64000 s.joinGroup(InetAddress.getByName(group)); //22.214.171.124 for one, and 126.96.36.199 for another byte buf = new byte; DatagramPacket pack = new DatagramPacket(buf, buf.length); s.receive(pack); s.leaveGroup(InetAddress.getByName(group)); s.close();
Is this how multicast is supposed to work (seems kind of stupid since groups are totally irrelevant if so), is it a Java bug possibly, or are there dumb things a sys admin can do to configure things to cause this to happen?
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