Transport Considerations for IP and UDP Proxying in MASQUE
draft-westerlund-masque-transport-issues-00

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Last updated 2020-07-10
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MASQUE                                                     M. Westerlund
Internet-Draft                                                  M. Ihlar
Intended status: Informational                                 Z. Sarker
Expires: 11 January 2021                                   M. Kuehlewind
                                                                Ericsson
                                                            10 July 2020

       Transport Considerations for IP and UDP Proxying in MASQUE
              draft-westerlund-masque-transport-issues-00

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.

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Westerlund, et al.       Expires 11 January 2021                [Page 1]
Internet-Draft     Transport Considerations for MASQUE         July 2020

   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 11 January 2021.

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   document authors.  All rights reserved.

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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 . . . . . . . . . . . . . . . . . . . . . . .   7
       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  . . . . . . . . . . . . . . .  10
       2.1.8.  Time to Live / Hop Limit  . . . . . . . . . . . . . .  11
       2.1.9.  Header Checksum (IPv4 Only) . . . . . . . . . . . . .  11
       2.1.10. Source and Destination Address  . . . . . . . . . . .  11
     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  . . . . . . . . . . . . . . . . . . . . . .  13
   4.  ICMP  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   5.  Maximum Transmission Unit (MTU) . . . . . . . . . . . . . . .  15
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