IP multicast

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IP multicast

A one-to-many transmission of data over an IP network. It is used for myriad purposes including updating routers, announcing and discovering services and streaming media. IP multicast saves network bandwidth, because packets are transmitted as one stream over the backbone and only split apart to the target stations by the router at the end of the path. See mDNS and multicast.

Multicast Address Range
IP multicast packets are identified by using a destination address in a range from 224.0.0.0 to 224.0.0.255. The addresses within the range are reserved for specific purposes. For example, 224.0.0.1 means all nodes on the subnet, while 224.0.0.2 means all routers on the subnet. The address 224.0.0.251 is reserved for multicast DNS (mDNS), which is used to query devices for their capabilities. For the complete list, visit www.iana.org/assignments/multicast-addresses. See DVMRP, MOSPF and PIM.
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References in periodicals archive ?
In this way, applications can send messages to an IP multicast address and expect the network layer to redistribute the messages appropriately (see Figure 3).
The multicast applications included with the Proteon MOSPF implementation are: a multicast pinger (a common IP diagnostic tool), interactive commands so the router itself can join and leave multicast groups (and so respond to multicast pings), and the ability to send network management alerts to an IP multicast address. Any of the Internet's IGMP-based multicast applications, such as the voice conferencing program "vat," can be used with the MOSPF implementation.
When the RIF indicates that the packet must traverse the TCP/IP internet, multicast can again be gainfully employed, this time to an IP multicast address that is algorithmically derived from the destination token ring segment's bridging address.