Stream Control Transmission Protocol (SCTP) Network Address Translation Support
draft-ietf-tsvwg-natsupp-12
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Active Internet-Draft (tsvwg WG)
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Last updated |
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2018-07-02
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Replaces |
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draft-stewart-natsupp-tsvwg, draft-ietf-behave-sctpnat
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Stream |
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IETF
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Intended RFC status |
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Proposed Standard
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plain text
pdf
html
bibtex
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WG state
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WG Document
(wg milestone:
Oct 2018 - Submit 'SCTP NAT Sup...
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Document shepherd |
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Gorry Fairhurst
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IESG state |
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I-D Exists (IESG: Dead)
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Spencer Dawkins
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Send notices to |
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"Gorry Fairhurst" <gorry@erg.abdn.ac.uk>
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Network Working Group R. Stewart
Internet-Draft Netflix, Inc.
Intended status: Standards Track M. Tuexen
Expires: January 3, 2019 I. Ruengeler
Muenster Univ. of Appl. Sciences
July 2, 2018
Stream Control Transmission Protocol (SCTP) Network Address Translation
Support
draft-ietf-tsvwg-natsupp-12.txt
Abstract
The Stream Control Transmission Protocol (SCTP) provides a reliable
communications channel between two end-hosts in many ways similar to
the Transmission Control Protocol (TCP). With the widespread
deployment of Network Address Translators (NAT), specialized code has
been added to NAT for TCP that allows multiple hosts to reside behind
a NAT and yet use only a single globally unique IPv4 address, even
when two hosts (behind a NAT) choose the same port numbers for their
connection. This additional code is sometimes classified as Network
Address and Port Translation (NAPT).
This document describes the protocol extensions required for the SCTP
endpoints and the mechanisms for NATs necessary to provide similar
features of NAPT in the single-point and multi-point traversal
scenario.
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 January 3, 2019.
Stewart, et al. Expires January 3, 2019 [Page 1]
Internet-Draft SCTP NAT Support July 2018
Copyright Notice
Copyright (c) 2018 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 and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1. SCTP NAT Traversal Scenarios . . . . . . . . . . . . . . 6
4.1.1. Single Point Traversal . . . . . . . . . . . . . . . 6
4.1.2. Multi Point Traversal . . . . . . . . . . . . . . . . 7
4.2. Limitations of Classical NAPT for SCTP . . . . . . . . . 8
4.3. The SCTP Specific Variant of NAT . . . . . . . . . . . . 8
5. Data Formats . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1. Modified Chunks . . . . . . . . . . . . . . . . . . . . . 12
5.1.1. Extended ABORT Chunk . . . . . . . . . . . . . . . . 12
5.1.2. Extended ERROR Chunk . . . . . . . . . . . . . . . . 13
5.2. New Error Causes . . . . . . . . . . . . . . . . . . . . 13
5.2.1. VTag and Port Number Collision Error Cause . . . . . 13
5.2.2. Missing State Error Cause . . . . . . . . . . . . . . 14
5.2.3. Port Number Collision Error Cause . . . . . . . . . . 15
5.3. New Parameters . . . . . . . . . . . . . . . . . . . . . 15
5.3.1. Disable Restart Parameter . . . . . . . . . . . . . . 16
5.3.2. VTags Parameter . . . . . . . . . . . . . . . . . . . 16
6. Procedures for SCTP End Points and NATs . . . . . . . . . . . 17
6.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2. Association Setup Considerations . . . . . . . . . . . . 18
6.3. Handling of Internal Port Number and Verification Tag
Collisions . . . . . . . . . . . . . . . . . . . . . . . 18
6.4. Handling of Internal Port Number Collisions . . . . . . . 19
6.5. Handling of Missing State . . . . . . . . . . . . . . . . 20
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