An Inventory of Transport-centric Functions Provided by Middleboxes: An Operator Perspective
draft-dolson-transport-middlebox-05

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Last updated 2018-12-10 (latest revision 2018-12-06)
Replaces draft-dolson-plus-middlebox-benefits
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Network Working Group                                     D. Dolson, Ed.
Internet-Draft
Intended status: Informational                               J. Snellman
Expires: June 9, 2019
                                                       M. Boucadair, Ed.
                                                            C. Jacquenet
                                                                  Orange
                                                       December 06, 2018

An Inventory of Transport-centric Functions Provided by Middleboxes: An
                          Operator Perspective
                  draft-dolson-transport-middlebox-05

Abstract

   This document summarizes an operator's perception of the benefits
   that may 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.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://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 June 9, 2019.

Dolson, et al.            Expires June 9, 2019                  [Page 1]
Internet-Draft    Transport-centric Middlebox Functions    December 2018

Copyright Notice

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   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.  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
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   7.  Informative References  . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20
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