OverSim. A Flexible Overlay Network Simulation Framework. Ingmar Baumgart, Bernhard Heep, Stephan Krause
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1 OverSim A Flexible Overlay Network Simulation Framework Ingmar Baumgart, Bernhard Heep, IEEE Global Internet Symposium 2007, Anchorage, AK, USA
2 Requirements Overlay Flexibility Scalability Underlay Heterogeneity Terminal Mobility Backbone simulation 1
3 Additional Requirements Interoperability PlanetLab experiments Network emulation Debugging and Overlay visualization 2
4 State of the Art 3 No established standard overlay simulator Most promising: P2PSim, OverlayWeaver and PlanetSim P2PSim ( Many implemented overlay protocols No real world interconnection, no visualization OverlayWeaver ( Real world interconnection No simulation of underlying network, not scalable PlanetSim ( Flexible and scalable Only very simplistic model of underlying network
5 Outline How to implement all required features? Overlay layer: Flexibility, scalability Underlay model: Heterogeneity, terminal mobility, backbone simulation Interoperability, network emulation Debugging and overlay visualization Featured Overlays and Applications 4 Performance Evaluation and Validation
6 Flexibility 5 Modular architecture Based on OMNeT++ Layered architecture Underlying network Overlay layer Application layer Consistent interfaces between layers UDP between network and overlay Application Layer Common API Interface Overlay Layer UDP Interface Underlying Network Common API between overlay and application Exchange of one component is transparent to all other components
7 Scalability 6 Tradeoff: Level of detail vs. simulation speed Maximum scalability SimpleUnderlay Packets are exchanged directly between nodes Minimizes number of events Simple scenario: Constant delay For more realistic delays: Place nodes in Euclidian space Delay is proportional to distance No additional events needed Still scalable
8 Heterogeneity and Mobility Extension of the synthetic coordinate model Nodes are assigned to an access net with specific bandwidth and delay characteristics Calculated packet delay: l = c A B 2 d + + p e = d A + + b A +d B + l b p B A B 7 Mobility: Move node to new coordinate, change access net characteristics and IP address
9 Backbone Simulation 8 For detailed simulation of the underlying network: INETUnderlay Based on INET framework for OMNeT++ Simulates a complete IP backbone Access routers attached to backbone routers Simulates all effects of heterogeneous access networks Bandwidth, Delay, Packet loss, Queuing effects Mobility is simulated by moving a node from one access router to another
10 Interoperation 9 For PlanetLab experiments and interconnecting with real world implementations: Emulated nodes in real networks Event scheduler runs at real time Linux TUN device for exchanging packets with a real network External applications can be connected to the simulation
11 Network Emulation For demonstrational purposes: Real nodes in emulated networks Emulate overlay network with INETUnderlay Add a gateway node This router features a TUN interface External devices can communicate with simulated overlay 10
12 Visualization and Debugging Topology visualization Message visualization Node state debugging 11
13 Overlay Protocols Implemented overlay protocols Structured: Chord, Pastry, Koorde, Broose Unstructured: GIA Gaming protocols/multicast: VAST Base class for structured overlays to facilitate implementation of new overlay protocols Overlay message handling (RPC, statistics) Generic lookup function Bootstrapping support Overlay topology visualization 12
14 OverSim Performance Evaluation 13 Compare simulation speed with P2PSim Underlay model: P2PSim and OverSim/SimpleUnderlay: Constant delay of 50 msec OverSim/INETUnderlay: Randomly generated backbone (40 routers) Number of nodes: 1,000, 10,000 and 100,000 Simulated time period: 1,000 seconds Overlay: Chord Stabilize interval: 20 sec Fix fingers interval: 120 sec Each node sends a query every 10 sec
15 Performance Evaluation Results 14 OverSim is faster even with greater level of detail
16 Validation: Chord Results 15 Simulation results are comparable to P2PSim s
17 Conclusion & Future Work OverSim is a new, modular overlay simulator Focus on scalability and flexibility Various underlay models for maximum speed, maximum precision or real network use Many implemented overlay protocols Easily extendable 16 Future work: New overlay protocols and applications Kademlia, Scribe, i3, P2PSIP Import models from topology generators Import datasets from internet latency measurements
18 Download now! Try now! Contribute now!
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