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Standards-Based P2P Communications Systems

Explore the advantages and challenges of Peer-to-Peer (P2P) communications systems, focusing on SIP protocol for VoIP and Instant Messaging. Learn about self-organized networks, security concepts, routing scalability, and simulations.

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Standards-Based P2P Communications Systems

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  1. Standards-Based P2P Communications Systems David A. Bryan College of William and Mary April 1, 2005 Advisor: Bruce B. Lowekamp

  2. VoIP/IM • VoIP – Voice over IP (Internet Protocol) • IM – Instant Messaging (such as AOL) • Communications systems running over a network – not always the public Internet • Private networks (corporation, research lab) • Remote/ephemeral networks (sensor networks, meetings, battlefields, etc.) • Next generation (3G and later) cellular phones run over IP networks

  3. Traditional Architecture(Client/Server)

  4. Problems with Traditional Architecture Organization B Internet Organization A

  5. Peer-to-Peer (P2P) • Instead of a central server providing services, the members of the network collaborate to provide them as peers • Each node in addition to be a client is responsible for some portion of server work • Classic example is file sharing (Napster and the like)

  6. P2P Architecture

  7. Peer-to-Peer (P2P) Advantages • Scales Well (as new nodes join, they bring more server power) • Highly distributed • Low maintenance • Robust (one node failure doesn’t hurt network) • Can be run internally (with NO outside connections)

  8. Peer-to-Peer (P2P) Problems • Instead of a central server, relying on other possibly “bad” nodes • Other nodes “snooping” • Abuse (for example filesharing) • Denial of Service (DoS) • Node prevents/denies access to other nodes • Sybil attacks • Corrupting information

  9. SOSIMPLE • SIP • IETF (Internet Engineering Task Force) defined a protocol for VoIP, called SIP • Designed for packet networks, useful for any sort of multimedia session establishment • Support for integration with email/web services • SIMPLE is a set of extensions to SIP to support instant messaging • SOSIMPLE : Self-Organized SIMPLE

  10. Why SIP? • Widely used today for VoIP and IM • Vonage, Microsoft MSN • Large investment • $$$ (phones, gateways) • Effort (applications, stacks) • Reuse/cheap COTS devices • SIP is extensible – we can extend for P2P • Used SIP’s REGISTRATION support

  11. Research • Defining a protocol for P2P SIP • Completed this work, presented it to the IETF for standardization • Implementation • Currently finishing up a working version as a proof-of-concept • Security Concepts • Scalability and Routing • Simulations • Social Routing

  12. Questions? • Email : bryan@cs.wm.edu • Web : • http://www.cs.wm.edu/~bryan • http://www.p2psip.org • Documents (available at above sites) • IETF draft describing protocol • White papers/publications describing our approach and research

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