1)Reliability: The UDP packets might be lost depending on the network
conditions, as you may know.
As I said, the callback message in this application-specific case is affordable to be lost.
2)Security : The multicast pakets have a risk to wiretap by unconcerned
people (i.e. many other clients).
You have to encrypted the message.
3)Traffic : The multicasting is the couse of high-traffic network.
No. It is much better than multiple TCP connections.
4)Scope : The scope of the multicasting will be inside the private
network such as 'the same segment' or 'intranet'.
This is true is most cases. But the multi-cast can go over segments if IP multicast router is installed.
Rgds, Ricky
