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Assume that you have an application on a host that does not
support IP multicast, only IP unicast and broadcast. Further assume
that the application wants to send to a receiver or multiple
receivers on a different subnet. We have seen in Chapter 2, “Internet Protocol (IP)
Addresses,” that
this is not possible, at least not yet. Using IP unicast only allows
the sender to send to one host, and IP broadcast only allows the
sender to send to hosts on the same subnet. What we need is a way to
turn a broadcast into a multicast for delivery to the receivers. Now
if the receivers cannot receive multicast traffic, then the
multicast stream would need to be converted back to a broadcast
stream on the receiving subnet (see Figure 9-3). |
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