An Inventory of Transport-centric Functions Provided by Middleboxes
draft-dolson-transport-middlebox-03

Document Type Active Internet-Draft (individual)
Last updated 2018-06-20
Replaces draft-dolson-plus-middlebox-benefits
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Network Working Group                                          D. Dolson
Internet-Draft
Intended status: Informational                               J. Snellman
Expires: December 22, 2018
                                                            M. Boucadair
                                                            C. Jacquenet
                                                                  Orange
                                                           June 20, 2018

  An Inventory of Transport-centric Functions Provided by Middleboxes
                  draft-dolson-transport-middlebox-03

Abstract

   This document summarizes benefits that operators perceive to be
   provided by intermediary devices that execute functions beyond 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, 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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   This Internet-Draft will expire on December 22, 2018.

Dolson, et al.          Expires December 22, 2018               [Page 1]
Internet-Draft    Transport-centric Middlebox Functions        June 2018

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   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Operator Perspective  . . . . . . . . . . . . . . . . . .   3
     1.2.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Measurements  . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Packet Loss . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Round Trip Times  . . . . . . . . . . . . . . . . . . . .   6
     2.3.  Measuring Packet Reordering . . . . . . . . . . . . . . .   6
     2.4.  Throughput and Bottleneck Identification  . . . . . . . .   7
     2.5.  Congestion Responsiveness . . . . . . . . . . . . . . . .   7
     2.6.  Attack Detection  . . . . . . . . . . . . . . . . . . . .   7
     2.7.  Packet Corruption . . . . . . . . . . . . . . . . . . . .   8
     2.8.  Application-Layer Measurements  . . . . . . . . . . . . .   8
   3.  Functions Beyond Measurement: A Few Examples  . . . . . . . .   9
     3.1.  NAT . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     3.2.  Firewall  . . . . . . . . . . . . . . . . . . . . . . . .   9
     3.3.  DDoS Scrubbing  . . . . . . . . . . . . . . . . . . . . .  10
     3.4.  Implicit Identification . . . . . . . . . . . . . . . . .  11
     3.5.  Performance-Enhancing Proxies . . . . . . . . . . . . . .  11
     3.6.  Network Coding  . . . . . . . . . . . . . . . . . . . . .  12
     3.7.  Network-Assisted Bandwidth Aggregation  . . . . . . . . .  12
     3.8.  Prioritization and Differentiated Services  . . . . . . .  13
     3.9.  Measurement-Based Shaping . . . . . . . . . . . . . . . .  13
     3.10. Fairness to End-User Quota  . . . . . . . . . . . . . . .  14
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
     5.1.  Confidentiality & Privacy . . . . . . . . . . . . . . . .  14
     5.2.  Active On-Path Attacks  . . . . . . . . . . . . . . . . .  15
     5.3.  Improved Security . . . . . . . . . . . . . . . . . . . .  15
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