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Network Programming for Microsoft® Windows®, Second Edition by Jim Ohlund, Anthony Jones

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Reliable Multicasting

The reliable multicasting provider is available on Windows XP when the Microsoft Message Queuing (MSMQ) component is installed. Reliable multicasting is a protocol built over IPv4 multicasting. Currently, it does not support IPv6. The reliable multicast implementation on Windows XP is based on the Pragmatic General Multicasting (PGM) specification. The protocol is NAK-based, meaning that all receivers of the data send notice to the sender only when it detects that a packet is missing. If the protocol was acknowledgment-based, like TCP, you would have cases in which hundreds or possibly thousands of receivers sent a packet to the sender indicating they successfully received a packet, which would flood the sender’s network. ...

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