Transport Considerations for IP and UDP Proxying in MASQUE
draft-westerlund-masque-transport-issues-01

Document Type Active Internet-Draft (individual)
Authors Magnus Westerlund  , Marcus Ihlar  , Zaheduzzaman Sarker  , Mirja K├╝hlewind 
Last updated 2021-01-12
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MASQUE                                                     M. Westerlund
Internet-Draft                                                  M. Ihlar
Intended status: Informational                                 Z. Sarker
Expires: 16 July 2021                                      M. Kuehlewind
                                                                Ericsson
                                                         12 January 2021

       Transport Considerations for IP and UDP Proxying in MASQUE
            draft-westerlund-masque-transport-issues-01

Abstract

   The HTTP Connect method uses back-to-back TCP connections to and from
   a proxy.  Such a solution takes care of many transport aspects as
   well as IP Flow related concerns.  With UDP and IP proxying on the
   other hand, there are several per-packet and per-flow aspects that
   need consideration to preserve the properties of end- to-end IP/UDP
   flows.  The aim of this document is to highlight and provide
   solutions for these issues related to UDP and IP proxying.

Discussion Venues

   This note is to be removed before publishing as an RFC.

   Discussion of this document takes place on the MASQUE Working Group
   mailing list (masque@ietf.org), which is archived at
   https://mailarchive.ietf.org/arch/browse/masque/
   (https://mailarchive.ietf.org/arch/browse/masque/).

   Source for this draft and an issue tracker can be found at
   https://github.com/gloinul/draft-westerlund-masque-transport-issues
   (https://github.com/gloinul/draft-westerlund-masque-transport-
   issues).

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/.

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Internet-Draft     Transport Considerations for MASQUE      January 2021

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on 16 July 2021.

Copyright Notice

   Copyright (c) 2021 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 (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
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   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Definitions . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  HTTP Connect  . . . . . . . . . . . . . . . . . . . . . .   5
     1.3.  TURN  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.4.  HTTP Connect-UDP  . . . . . . . . . . . . . . . . . . . .   6
   2.  Review of IP Header . . . . . . . . . . . . . . . . . . . . .   7
     2.1.  Base Header Fields  . . . . . . . . . . . . . . . . . . .   7
       2.1.1.  Version . . . . . . . . . . . . . . . . . . . . . . .   8
       2.1.2.  DSCP  . . . . . . . . . . . . . . . . . . . . . . . .   8
       2.1.3.  ECN . . . . . . . . . . . . . . . . . . . . . . . . .   9
       2.1.4.  Identification, Flags, and Fragmentation offset (IPv4
               Only) . . . . . . . . . . . . . . . . . . . . . . . .  10
       2.1.5.  Flow Label (IPv6 Only)  . . . . . . . . . . . . . . .  10
       2.1.6.  Total Length / Payload length . . . . . . . . . . . .  10
       2.1.7.  Protocol / Next Header  . . . . . . . . . . . . . . .  11
       2.1.8.  Time to Live / Hop Limit  . . . . . . . . . . . . . .  11
       2.1.9.  Header Checksum (IPv4 Only) . . . . . . . . . . . . .  11
       2.1.10. Source and Destination Address  . . . . . . . . . . .  12
     2.2.  IPv4 Options Header . . . . . . . . . . . . . . . . . . .  12
     2.3.  IPv6 Extension Headers  . . . . . . . . . . . . . . . . .  12
   3.  Review of UDP Header  . . . . . . . . . . . . . . . . . . . .  13
     3.1.  Source and Destination Port . . . . . . . . . . . . . . .  13
     3.2.  UDP Length  . . . . . . . . . . . . . . . . . . . . . . .  13
     3.3.  UDP Checksum  . . . . . . . . . . . . . . . . . . . . . .  14
   4.  ICMP  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14

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