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What is IP unicast encapsulation of IP multicast datagrams ?

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Can someone please simplify with an appropriate example ?

posted Aug 3, 2014 by Ganesh

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Lets first understand MBone to understand the need of the encapsulation for IP Multicast -

The MBone (Internet multicast backbone), is the portion of the Internet that supports the forwarding of Internet-based IP multicast traffic. The MBone, used in conjunction with tunneling, provides a way for multicast traffic to travel across portions of the Internet that do not support multicasting.

Tunneling is the encapsulation of a datagram within another datagram. For multicast traffic to traverse the Internet, each IP multicast datagram must be encapsulated within an IP unicast datagram, which is known as IP-in-IP tunneling. An IP-in-IP tunnel is used to forward information between endpoints in an IP internetwork that have differing capabilities, thus acting as a logical link between the endpoints. The encapsulating IP header includes the addresses of the endpoints as the source and destination addresses.

Source: http://technet.microsoft.com/en-us/library/cc759719(v=ws.10).aspx

answer Aug 3, 2014 by Salil Agrawal
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