Beneficial Functions of Middleboxes
draft-dolson-plus-middlebox-benefits-03

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Last updated 2017-03-09
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Internet Engineering Task Force                                D. Dolson
Internet-Draft                                               J. Snellman
Intended status: Informational                                  Sandvine
Expires: September 10, 2017                                 M. Boucadair
                                                            C. Jacquenet
                                                                  Orange
                                                           March 9, 2017

                  Beneficial Functions of Middleboxes
                draft-dolson-plus-middlebox-benefits-03

Abstract

   At IETF97, at a meeting regarding the Path Layer UDP Substrate (PLUS)
   protocol, a request was made for documentation about the benefits
   that might be provided by permitting middleboxes to have some
   visibility to transport-layer information.

   This document summarizes benefits provided to the Internet by
   intermediary devices that provide functions apart from normal IP
   forwarding.  Such intermediary devices are often called
   "middleboxes".

   RFC3234 defines a taxonomy of middleboxes and issues in the Internet.
   Most of those middleboxes utilize or modify application-layer data.
   This document primarily focuses on devices that observe and act on
   information carried in the transport layer, and especially
   information carried in TCP packets.

   A primary goal of this document is to provide information to working
   groups developing new transport protocols, in particular the PLUS and
   QUIC working groups, to aid understanding of what might be gained or
   lost by design decisions that may affect (or be affected by)
   middlebox operation.

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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   and may be updated, replaced, or obsoleted by other documents at any

Dolson, et al.         Expires September 10, 2017               [Page 1]
Internet-Draft     Beneficial Functions of Middleboxes        March 2017

   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 September 10, 2017.

Copyright Notice

   Copyright (c) 2017 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Measurements  . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Packet Loss . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Round Trip Times  . . . . . . . . . . . . . . . . . . . .   5
     2.3.  Measuring Packet Reordering . . . . . . . . . . . . . . .   5
     2.4.  Throughput and Bottleneck Identification  . . . . . . . .   6
     2.5.  DDoS Detection  . . . . . . . . . . . . . . . . . . . . .   6
     2.6.  Packet Corruption . . . . . . . . . . . . . . . . . . . .   7
     2.7.  Application-Layer Measurements  . . . . . . . . . . . . .   7
   3.  Functions Beyond Measurement: A Few Examples  . . . . . . . .   7
     3.1.  NAT . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.2.  Firewall  . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.3.  DDoS Scrubbing  . . . . . . . . . . . . . . . . . . . . .   8
     3.4.  Implicit Identification . . . . . . . . . . . . . . . . .   9
     3.5.  Performance-Enhancing Proxies . . . . . . . . . . . . . .  10
     3.6.  Network Coding  . . . . . . . . . . . . . . . . . . . . .  10
     3.7.  Network-Assisted Bandwidth Aggregation  . . . . . . . . .  10
     3.8.  Prioritization and Differentiated Services  . . . . . . .  11
     3.9.  Measurement-Based Shaping . . . . . . . . . . . . . . . .  12
     3.10. Fairness to End-User Quota  . . . . . . . . . . . . . . .  12
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