Peer-to-Peer Streaming Peer Protocol (PPSPP)
draft-ietf-ppsp-peer-protocol-02

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Document Type Active Internet-Draft (ppsp WG)
Last updated 2012-06-19
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PPSP                                                           A. Bakker
Internet-Draft                                               R. Petrocco
Intended status: Informational             Technische Universiteit Delft
Expires: December 22, 2012                                 June 20, 2012

              Peer-to-Peer Streaming Peer Protocol (PPSPP)
                    draft-ietf-ppsp-peer-protocol-02

Abstract

   The Peer-to-Peer Streaming Peer Protocol (PPSPP) is a peer-to-peer
   based transport protocol for content dissemination.  It can be used
   for streaming on-demand and live video content, as well as
   conventional downloading.  In PPSPP, the clients consuming the
   content participate in the dissemination by forwarding the content to
   other clients via a mesh-like structure.  It is a generic protocol
   which can run directly on top of UDP, TCP, or as a RTP profile.
   Features of PPSPP are short time-till-playback and extensibility.
   Hence, it can use different mechanisms to prevent freeriding, and
   work with different peer discovery schemes (centralized trackers or
   Distributed Hash Tables).  Depending on the underlying transport
   protocol, PPSPP can also use different congestion control algorithms,
   such as LEDBAT, and offer transparent NAT traversal.  Finally, PPSPP
   maintains only a small amount of state per peer and detects malicious
   modification of content.  This documents describes PPSPP and how it
   satisfies the requirements for the IETF Peer-to-Peer Streaming
   Protocol (PPSP) Working Group's peer protocol.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 22, 2012.

Copyright Notice

Bakker & Petrocco       Expires December 22, 2012               [Page 1]
Internet-Draft             PPSP Peer Protocol                  June 2012

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
     1.1.  Purpose  . . . . . . . . . . . . . . . . . . . . . . . . .  5
     1.2.  Requirements Language  . . . . . . . . . . . . . . . . . .  6
     1.3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  6
   2.  Overall Operation  . . . . . . . . . . . . . . . . . . . . . .  7
     2.1.  Joining a Swarm  . . . . . . . . . . . . . . . . . . . . .  8
     2.2.  Exchanging Chunks  . . . . . . . . . . . . . . . . . . . .  8
     2.3.  Leaving a Swarm  . . . . . . . . . . . . . . . . . . . . .  9
   3.  Messages . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.1.  HANDSHAKE  . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.2.  HAVE . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     3.3.  ACK  . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     3.4.  DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     3.5.  INTEGRITY  . . . . . . . . . . . . . . . . . . . . . . . . 10
     3.6.  REQUEST  . . . . . . . . . . . . . . . . . . . . . . . . . 11
     3.7.  CANCEL . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     3.8.  Peer Address Exchange and NAT Hole Punching  . . . . . . . 11
       3.8.1.  PEX_REQ and PEX_RES Messages . . . . . . . . . . . . . 11
       3.8.2.  Hole Punching via PPSPP Messages . . . . . . . . . . . 12
     3.9.  Keep Alive Signaling . . . . . . . . . . . . . . . . . . . 12
     3.10. Directory Lists  . . . . . . . . . . . . . . . . . . . . . 13
     3.11. Storage Independence . . . . . . . . . . . . . . . . . . . 13
   4.  Chunk Addressing Schemes . . . . . . . . . . . . . . . . . . . 13
     4.1.  Bin Numbers  . . . . . . . . . . . . . . . . . . . . . . . 13
       4.1.1.  In HAVE Messages . . . . . . . . . . . . . . . . . . . 14
       4.1.2.  In ACK Messages  . . . . . . . . . . . . . . . . . . . 15
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