MBONE

• Internet Multicast Backbone: testbed

• Thousands of regions connected by virtual point-to-point links called “tunnels”.

  • Multicast traffic passes through non-multicast regions using IP-in-IP encapsulation.
  • Intermediate routers see only wrappers (regular IP-unicast packets)
  • Tunnel endpoint recognizes IP-in-IP (protocol type = 4) and decapsulates datagram for processing

• MBONE uses DVMRP (mrouted)

  • Limited to few senders. Many small groups also undesired

• Tools: sdr (session directory), vic, vat, wb

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