| Summary: | 碩士 === 淡江大學 === 資訊工程學系 === 85 === There are three kinds of network transport service over Internet
: unicast, multicast, and broadcast transport services. Each
kind service has its own characteristics and drawbacks. Among
them, a better way to transmit data from one source to many
destinations is to provide a multicast transport service. With a
multicast transport service, a single node can send data to
multiple destinations by making a single service call. However,
most existing high-level network protocols provide the unicast
transport seThe multicast transport service is a very important
capability for DIS exercise. In DIS standard, application
protocol uses this function to reduce network traffic while
supporting real-time interactions among networked virtual
reality systems. However, Internet does not innately support
multicast capacity, whereas existing DIS network environments
are built on either Defense Simulation Internet (DSI) or
Multicast Backbone (MBone). Both DSI and MBone are special
networks since they use dedicate multicast roIn this thesis, a
new concept called Virtual Multicast Router (VMR) is proposed.
Virtual Multicast Router uses a well-known concept, Tunnel, over
Internet to provide multicast transport service. First,
multicasted data are sent to the source Virtual Multicast Router
to encapsulate these multicasted data into unicast packets, and
send them into Internet. After receiving those unicast packets,
destination Virtual Multicast Router decapsulate these unicast
packets and broadcast them over its subnet. With this
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