Service composition data) send(id,data) Mobility.Reliability, congestion control, and flow-control implemented at end-hosts Promise.Triggers are periodically refreshed by end-hosts.To receive a packet with identifier id, receiver R maintains a trigger (id, R) into the overlay network Sender Receiver (R) Model.Each packet is associated an identifier id.Provide a rendezvous based communication abstraction (instead of point-to-point).Incrementally deployable no need to change IP IP router i3 node data) send(id, data) trigger id R i3 Communication Abstraction.Use an overlay network to implement it.Add an efficient indirection layer on top of IP.Mobile IP assumes a physical indirection point: the home agent Solution: Internet Indirection Infrastructure (i3).IP multicast assumes a logical indirection point: the IP multicast address.Assume a logical or physical indirection point interposed between sender(s) and receiver(s).All previous solutions use a simple but powerful technique: indirection. No synergy each application implements usually only one service, services hard to combine Observation.Redundancy: Each application implements the same functionality over and over again.Application level multicast (e.g., Fastforward, Narada, Overcast, Scattercast…).Implement the required functionality at the application level, e.g.,.Require community wide consensus - hard to achieve in practice Level Solutions.Difficult to implement while maintaining Internet’s scalability (e.g., multicast).Extend IP to support new communication primitives, e.g.,.E.g., a host identified by the IP address 128.32.xxx.xxx is located in Berkeley Solutions.Point-to-point communication abstraction implicitly assumes that there is one sender and one receiver, and that they are placed at fixed and well-known locations.… not appropriate for applications that require other communications primitives:.This abstraction allows Internet to be highly scalable and efficient, but….Send packet “p” from host “A” to host “B”.Today’s Internet is built around a unicast point-to-point communication abstraction:.Internet Indirection Infrastructure Ion Stoica April 16, 2003
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