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IETF P2P Mechanisms

IETF P2P Mechanisms. Wes Eddy / TSV AD MTI Systems wes@mti-systems.com. TSVAREA Meeting @ IETF 81 – Quebec City, July 2011. Purpose Today. The TSV area includes several WGs working on protocols that assist in building P2P apps

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IETF P2P Mechanisms

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  1. IETF P2P Mechanisms Wes Eddy / TSV AD MTI Systems wes@mti-systems.com TSVAREA Meeting @ IETF 81 – Quebec City, July 2011

  2. Purpose Today • The TSV area includes several WGs working on protocols that assist in building P2P apps • Think about the P2P protocol/mechanism toolset being developed in IETF: • Much of the work is being done in TSV Area WGs • Is the toolbox complete for building P2P apps and services? What’s missing? • Does it meet needs of users, providers, etc?

  3. Primary P2P IETF/IRTF Groups • Suggest reading: “The Peer-to-Peer Invasion”, IETF Journal, volume 6, issue 1, June 2010: • http://isoc.org/wp/ietfjournal/?p=1746#more-1746 • IETF P2P WGs: • TSV Area: • P2P-Focused: ALTO, DECADE, LEDBAT, PPSP • P2P-Related: BEHAVE (for STUN, TURN, NAT behavior) • RAI Area: • P2P-Focused: P2PSIP • P2P-Related: MMUSIC (for ICE) • IRTF – P2PRG

  4. Building P2P Applications • Typically not just simply run directly over transport protocols • Other protocols and libraries providing additional services sit in between P2P Application P2P Application P2P and Transport Services Transport Protocols Transport Protocols Network Protocols Network Protocols

  5. Note • The diagrams in this presentation are simple approximations • The semantics aren’t strong • Don’t take them literally

  6. P2P Application Note: Some apps also need reputation and identity management, among other functions Data Transfer Peer and Resource Location / Selection Remote Resource Management ... P2P Services Protocols and Mechanisms LEDBAT DECADE ALTO RELOAD PPSP Additional Services Protocols and Mechanisms TLS / DTLS ICE STUN/TURN Transport Protocols Note: P2P apps do not generally use DCCP or SCTP due to NAT and OS support UDP TCP

  7. LEDBAT • Pretty much finished • Goals: • Develop an experimental congestion control mechanism that minimizes delay impact on other competing traffic (so bulk transfers can coexist peacefully with delay-sensitive real-time traffic) • Generic algorithm, not specific to a given transport framing P2P Application Data Transfer ... LEDBAT + Framing Transport Protocols UDP TCP

  8. P2PSIP - RELOAD P2P Application • Mature spec; WGLC; implementations exist • Charter Goals: • Develop distributed resource location protocol to avoid need for centralized SIP servers • Work through NATs • Develops the RELOAD (REsourceLOcation and Discovery) Protocol • Flexible overlay network protocol • Can support applications other than P2PSIP • NAT and firewall traversal via ICE Peer and Resource Location / Selection Remote Resource Management ... RELOAD Topology Plugin Overlay Link Protocol Connectivity Establishment Chord Algorithm ICE TLS / DTLS STUN/TURN Transport Protocols UDP TCP

  9. ALTO P2P Application • Maturing spec; implementations exist • Service to provide information supporting more intelligence in choosing among lists of peers • Inform applications of network preferences for various aspects of peer selection Peer and Resource Location / Selection ... ALTO HTTP Transport Protocols TCP

  10. DECADE P2P Application • Work in progress • Caching for P2P applications • Allow content to be stored beyond the “last-mile” and avoid bottlenecks at the edge Data Transfer Remote Resource Management ... Note: Protocol selection & design still to be done by the WG DECADE SDT & DRP ? ? ? WebDAV ? NFS SNIA CDMI HTTP Transport Protocols UDP TCP

  11. PPSP P2P Application • Work in progress • Goals: • Reduce difficulties in deploying infrastructure in CDNs and ISP P2P caches for N different protocols • Support nodes that may be either mobile or otherwise have limited resources • Includes: • Signaling protocol between tracker and peers • Signaling protocol between peers Data Transfer Peer and Resource Location / Selection ... PPSP Streaming Transport Peer Protocol Tracker Protocol ? ? Note: Protocol selection & design still to be done by the WG RELOAD ICE STUN/TURN Transport Protocols UDP TCP

  12. Synthesis ...

  13. P2P Application Data Transfer Remote Resource Management Peer and Resource Location / Selection ... PPSP ? LEDBAT ? DECADE RELOAD ALTO ? HTTP ? ICE TLS / DTLS STUN/TURN Note: I am NOT actually recommending to build an application like this! Transport Protocols UDP TCP

  14. Thoughts • There isn’t a lot of coupling or dependencies between our P2P WGs • NOTE: PPSP and DECADE are still early and may leverage other work done in other WGs • Not a clear long-term “architecture” yet for you to build actual classes of P2P applications using IETF technologies

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