Should (must )i give port number  Multicast / broadcast using JMF ?

hi,
i transmit jmf webcam usng RTP to unicast and multi-unicast ..
now i would like to multicast .. and broadcast ..
do i must give port number while multicast, broadcast ...
i came to multicast to avoid give port number same in receive and transmit
is there any way just transmit and receive webcam without giving port number ( multicat or broad cast or any other way)
plz give exact difference between multicast and broad cast ..
plzz...

Broadcast is link level, so LAN level. You transmit to all others host in the subnet using the broadcast addrees of the subnet(lan).
Multicast is over udp, so over ip. You can transmit over internet, if the router supports multicast. You need to use multicast ip addresses and of course 2 ports(udp) for each session.

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