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draft-gu-ppsp-peer-protocol-01

draft-gu-ppsp-peer-protocol-01. Y. Gu, D. A. Bryan IETF-79, Beijing China, November 12, 2010. Updates…. We have slightly changed our thoughts since the draft Do not want to have RELOAD as only way to establish connections between peers

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draft-gu-ppsp-peer-protocol-01

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  1. draft-gu-ppsp-peer-protocol-01 Y. Gu, D. A. Bryan IETF-79, Beijing China, November 12, 2010

  2. Updates… • We have slightly changed our thoughts since the draft • Do not want to have RELOAD as only way to establish connections between peers • Instead, allow different mechanisms to perform the establishment of connections • Peer Protocol itself becomes just about the messages exchanged via the gossip protocol

  3. Proposed Architecture Tracker IP and PeerID Tracker Protocol NAT Traversal / Connection Peer Peer Peer Protocol Peer

  4. Overview of Proposal • Early work to promote conversation! • Current version (-01) does not yet define specific messages • Defines where existing protocols will be reused, and where new work is required • Presents a list of requirements for the new protocol • Will be turned over to the requirements editors once we start the actual protocol definition

  5. Overview of Proposal (continued) • Protocol for exchanging information between peers, supporting mechanisms for the following: • Find peers participating in a swarm or channel • (This is in addition to peers returned by tracker) • Exchange information with other peers • Chunk lists (offline case) • Location/stream offset (live stream case) • Works with existing protocols to enable • Locating and establishing connections between peers • Negotiation of connection to exchange data • Peers then exchange data. The transmission protocol is also existing protocol, not newly defined or specified by PPSP group.

  6. Negotiating Transfer • Provide mechanism to negotiate actual connection • Allows flexibility for streaming (negotiate RTP or similar) or chunk transmission (perhaps HTTP). No fixed transfer protocol. • Several options: • Reuse SIP offer/answer mechanism (this is rather heavy) • Something like the Advertisement/Proposal model for session description (draft-peterson-sipcore-advprop-00) • Use messages in the peer protocol w/SDP to negotiate connections

  7. Open Issues / Questions • Similarity in query/response format for peer lists between tracker and peer protocols? • Allow both mechanisms? • Same format? • What search capabilities do we want for finding peers? • Can we search for dynamic properties, or only static? • Search on tracker or only peers? • Do we define bitmap format in protocol, or application/deployment specific? • Currently prefer deployment specific… • Again, the thorny question of encoding…XML/text or binary • We propose same encoding for peer and tracker protocol

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