StandardsBased P2P Communications Systems

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Standards-Based P2P Communications Systems

• David A. Bryan
• College of William and Mary
• April 1, 2005
• Advisor Bruce B. Lowekamp

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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

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Traditional Architecture(Client/Server)
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Problems with Traditional Architecture
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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)

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P2P Architecture
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Peer-to-Peer (P2P) Advantages

• Scales Well (as new nodes join, they bring more
  server power)
• Highly distributed
• Low maintenance
• Robust (one node failure doesnt hurt network)
• Can be run internally (with NO outside
  connections)

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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

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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

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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 SIPs REGISTRATION support

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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

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Questions?

• Email bryan_at_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