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Testbeds

Testbeds. Henning Schulzrinne Columbia University. Questions to get started. What are the fundamental networking questions? content distribution - distributed resource “new architecture”: airport model > 4 billion devices: does IPv6 work? deploying new services (multicast, QoS)

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Testbeds

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  1. Testbeds Henning Schulzrinne Columbia University CRI workshop (Boston, MA)

  2. Questions to get started • What are the fundamental networking questions? • content distribution - distributed resource • “new architecture”: airport model • > 4 billion devices: does IPv6 work? • deploying new services (multicast, QoS) • distributed data stream processing - computing in the core • application-sensitive (video); dyn. resource allocation; isolation • tolerance to (say) long latencies • security issues: network or not? • disconnected operation - network support • low-power networking CRI workshop (Boston, MA)

  3. Testbed goals • Testbed as an end, rather than (just) means to another end • Experiment with virtualization • Create smaller self-contained domains • Restructure the industry CRI workshop (Boston, MA)

  4. Why testbeds? • Which of these can be answered by testbeds? • experimental system: build, evaluate, write • PlanetLab, Emulab • deployment platform (e.g., Coral) • to be used by people • geographic scale (lots of users can reach it) • scale for routing? --> probably not • “show me” (industry, other researchers) • deploy things that are not yet mature CRI workshop (Boston, MA)

  5. Why testbeds? • Can’t build it at one institution • cost • scale (distances, nodes) • maintenance (technicians, programmers) • Can’t justify at one institution • cost vs. usage intensity CRI workshop (Boston, MA)

  6. Testbed models • “Internet3” • focus mainly on L2, L3 • high-performance, low-latency testbeds • Testbeds from commodity parts (e.g., routers) • subsystem components • transfer of technology to “real” routers? (cf. Linux model) • power as observable quantity • Federation of institution test beds • “cooperative” model (mutual resource sharing) • PlanetLab on steroids • resource-limited experiments (memory, CPU): who gets what? user count? • needs resources -- tiny right now • wireless motes, ORBIT: sign up for time • Kits and tools CRI workshop (Boston, MA)

  7. Testbeds and users • aware vs. oblivious users • old Gigabit testbeds, DARTnet ... Internet2 • roll out applications without access to actual testbed (Internet access) • performance isolation CRI workshop (Boston, MA)

  8. Testbed desirables • Representative testbed • large potential user population • running non-Linux • SETI@HOME for networking • Need programming model • language abstractions • data flow style, scheduling CRI workshop (Boston, MA)

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