The OverSim Overlay Framwork

OverSim is a flexible overlay network simulation framework based on OMNeT++. The framework includes several structured and unstructured peer-to-peer protocols like Chord, Pastry, Bamboo, Koorde, Broose, Gia, Kademlia, Pastry and Vast. These protocol implementations can be used for both simulation as well as real world networks. To facilitate the implementation of additional protocols and to make them more comparable OverSim provides several common functions like a generic lookup mechanism for structured peer-to-peer networks and an RPC interface. Several exchangeable underlay network models allow to simulate complex heterogeneous underlay networks as well as simplified networks for large-scale simulations. With OverSim simulations of overlay networks with up to 100,000 nodes are feasible.

History and contributors.

For up-to-date info, visit the current OverSim home page.

A few useful starting points for browsing the documentation:

the Usage Diagram includes all modules and networks
base classes: BaseOverlay, BaseApp, BaseRpc
overlay protocols: Chord, Gia, Broose, Koorde, Pastry, Kademlia, Bamboo,
Nice, Vast, NTree, Quon and PubSubMMOG
tier1 applications: KBRTestApp, DHT, GIASearchApp, RealWorldTestApp
and SimpleGameClient
tier2 applications: DHTTestApp, P2pns
tier3 applications: XmlRpcInterface
underlay models: SimpleUnderlayNetwork, InetUnderlayNetwork, InetUnderlayNetwork6, ReaSEUnderlayNetwork(1,2)
and SingleHostUnderlayNetwork
hosts: SimpleOverlayHost, InetOverlayHost, AccessRouter, OverlayAccessRouter, OverlayRouter etc.
network channels: simple_dsl, simple_ethernetline, simple_dsl_lossy, simple_ethernetline_lossy,
inet_dsl, inet_ethernetline, inet_dsl_lossy, inet_ethernetline_lossy, inet_fiberline
global modules: GlobalObserver, GlobalNodeList
message classes: BaseOverlayMessage, CommonAPIMessage, ExtAPIMessages,
KBRTestMessage, ChordMessage, GiaMessage, PastryMessage, SimpleUDPPacket, ...
control info classes (used in communication between protocol layers):
OverlayCtrlInfo
churn generators: LifetimeChurn, ParetoChurn, RandomChurn, NoChurn