Delivering and receiving multicast content across a unicast...

Details Delivering and receiving multicast content across a unicast... Delivering and receiving multicast content across a unicast...

2007-10-09

2007-10-09

Vaughn, William (Department: 2144)

Electrical computers and digital processing systems: multicomput

Computer-to-computer data routing

C709S227000, C709S230000

Reexamination Certificate

active

10268413

ABSTRACT:
Techniques for delivering and receiving multicast content across a unicast network are described. A system that supports delivery and reception of multicast content across a unicast network includes a first device and a second device. The first device may be a destination device or a multicast-enabled router. The second device is multicast-enabled, and may be a multicast-enabled router. The first device determines whether a route between a destination device and a source of multicast packets is multicast-enabled, sends a unicast request message that includes as a destination address an address associated with the source and is marked for interception by a second device based on the determination, and receives the multicast packets as unicast packets from the second device. The second device intercepts the unicast request message and delivers the multicast packets to the requesting device as unicast packets in response to the unicast request message. The unicast request message indicates the address of the source and a group address, i.e., a source/group address pair, associated with the multicast packets that the first device wishes to receive.

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Network Working Group RFC 3306, “Unicast-Prefix-based IPv6 Multicast Addresses”, Aug. 2002.
Network Working Group RFC 2991, “Multipath Issues in Unicast and Multicast Next-Hop Selection”, Nov. 2000.

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