Transport Protocol Issues of In-Network Computing Systems
draft-kunze-coinrg-transport-issues-00

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COINRG                                                          I. Kunze
Internet-Draft                                                 K. Wehrle
Intended status: Informational                    RWTH Aachen University
Expires: May 7, 2020                                   November 04, 2019

       Transport Protocol Issues of In-Network Computing Systems
                 draft-kunze-coinrg-transport-issues-00

Abstract

   Today's transport protocols offer a variety of functionality based on
   the notion that the network is to be treated as an unreliable
   communication medium.  Some, like TCP, establish a reliable
   connection on top of the unreliable network while others, like UDP,
   simply transmit datagrams without a connection and without guarantees
   into the network.  These fundamental differences in functionality
   have a significant impact on how COIN approaches can be designed and
   implemented.  Furthermore, traditional transport protocols are not
   designed for the multi-party communication principles that underlie
   many COIN approaches.  This document discusses selected
   characteristics of transport protocols which have to be adapted to
   support COIN functionality.

Status of This Memo

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   This Internet-Draft will expire on May 7, 2020.

Copyright Notice

   Copyright (c) 2019 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

Kunze & Wehrle             Expires May 7, 2020                  [Page 1]
Internet-Draft            COIN Transport Issues            November 2019

   (https://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Addressing  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Flow granularity  . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Authentication  . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Advanced Transport Features . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   9.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   10. Informative References  . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   A fundamental design choice of the Internet is that the network
   should be kept as simple as possible while complexity in the form of
   processing should ideally be located at the edges of the network,
   i.e., on end-hosts.  This choice is reflected in the widely known
   end-to-end principle which states that end-hosts directly address
   each other and perform all relevant computations while the only
   purpose of the network is to deliver the packets without modifying
   them.  Transport protocols are consequently designed to facilitate
   the direct communication between end-hosts.

   In practice, the end-to-end principle is often violated by
   intransparent middleboxes which alter transmitted packets, e.g., by
   dropping or changing header fields.  Contrary to that, COIN
   encourages explicit computations in the network which introduces an
   intertwined complexity as the concrete computations on the end-hosts
   critically depend on the functionality that is deployed in the
   network.  On another note, it challenges traditional end-to-end
   transport protocols as they lack means for addressing in-network
   computation entities and as they are generally not designed to
   include more than two devices into a communication.  Some of these
   problems are already presented in [I-D.draft-kutscher-coinrg-dir-00].
   This draft intends to discuss potential problems for traditional
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