Transport Considerations for IP and UDP Proxying in MASQUE
draft-westerlund-masque-transport-issues-00
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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.
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
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.
Copyright Notice
Copyright (c) 2020 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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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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