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By:	Bruce Bahlmann

A multicast group where there could be multiple sources. For example, a video teleconference could be created with three parties, each of which is generating audio and video data. With ASM, any receiver for a given group may decide to also become a source, which could interfere with a data stream. ASM provides a simple bidirectional multicast model for hosts at the expense of router complexity. Because any source can send packets to a group, the ASM model is vulnerable to denial-of-service attacks and the introduction of unauthorized traffic. ASM is necessary for many-to-many multicasting, but a more secure model is desirable for one-to-many multicasting.

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