MultiCast Probs

[christoph ganser]

Hi List

i have a little problem with multicast:
i wrote a little test application that has 2 threads, one is for 
sending, the other one for receiving multicast messages:
it some how does not work.

who do i have to setup a mutlicast socket?

i use a
class MCSender : public UDPTransmit, public Thread
for sending.

in MCSender::run i
setMulticast(true)
InetMcastAddress("224.5.5.5");
Socket::join(dest);
connect(dest, 9898);
setTimeToLive(255);
const char message[] = "Hello Multicast";
transmit( (const char*) &message, strlen( (const char*) &message));

i don't get any errors (all Error == errSuccess)

but using tcpdump i only see:
messages from my host > 224.5.5.5 (DF) [ttl 1]
and
my host > ALL-ROUTERS.MCAST.NET: igmp leave 224.5.5.5 (DF) [ttl 1]

for the receiver i
class MCReceiver: public Thread, public UDPReceive
setMulticast(true)
join(dest)
if (isInputReady)
   length = receive( buffer, buffer_len);
...

could any body give me a hint?

thanks for any help!

christoph