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Chapter 8.6. IP Routing > Multicasting

Multicasting

Most network routers support unicasting of traffic. Unicast traffic has one source and one destination. Windows 2000 also supports routing of multicast traffic. Multicast traffic can be directed at any host that is listening for the multicast traffic. Multicast traffic is used to distribute multimedia efficiently to many workstations at the same time or synchronize data by distributing files or database updates to multiple hosts at the same time. Routing of unicast traffic is easy because only one subnet is the destination. Multicast routing requires intelligent decisions by the router about whether to forward multicast traffic onto a subnet or not because a host may or may not be listening for multicast traffic on a specific network.

Multicasting is controlled by modifying properties on interfaces in the Internet Group Messaging Protocol (IGMP) section of IP routing in RRAS. To enable multicasting, you need to check the Enable IGMP checkbox, and choose either the IGMP router or IGMP proxy mode radio button on the General tab.


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