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Abstract

A method for using network address translation in switches and routers to define a virtual host as the source of a multicast channel within a single-source multicast model and to translate packet addresses from different multicast sources so that the packets appear to be originating from the virtual host. Address-translated packets are thus forwarded through a single-source multicast channel and received by the subscribing host(s)/clients as though the packets came from a single “virtual” source. This methodology can be used to map two or more sources simultaneously onto the same multicast channel. Such a mapping is useful, for example, to present multiple views of a sporting event video broadcast, provide advertisement insertion capability, or to support transparent fail-over to a backup video source in a critical multicast application. Subscribing client hosts in the multicast reception group simply subscribe to the single virtual host as the source of a multicast channel.

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