multicasting - how does the end station know....

From: Ronnie Royston (RonnieR@xxxxxxxxxxxxxxxxx)
Date: Tue Oct 31 2000 - 13:38:50 GMT-3


   
I understand that end stations register with their local router via IGMP to
join a particular multicast group. How does the end station know what group
(multicast address) he wants to join? Is that learned from the application
he is running? Also, because the layer 3 multicast addresses are not unique
when mapped to the layer 2 e-net/fddi, it seems like good design practice to
use multicast addresses that are far enough apart to not have a problem of
end host getting packets they do not want. Finally, if the applications do
in fact determine the multicast address, then how does one have control over
what addresses to employ?

Obviously, I need a little info on how the multicast addresses are chosen,
mapped to applications, and distributed to end stations. Any information is
greatly appreciated!



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