Stream Control Transmission Protocol (SCTP) Network Address Translation Support
draft-ietf-tsvwg-natsupp-11

Document Type Active Internet-Draft (tsvwg WG)
Last updated 2017-07-03
Replaces draft-stewart-natsupp-tsvwg, draft-ietf-behave-sctpnat
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state WG Document (wg milestone: May 2018 - Submit 'SCTP NAT Sup... )
Document shepherd Gorry Fairhurst
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Network Working Group                                         R. Stewart
Internet-Draft                                             Netflix, Inc.
Intended status: Standards Track                               M. Tuexen
Expires: January 4, 2018                                    I. Ruengeler
                                        Muenster Univ. of Appl. Sciences
                                                            July 3, 2017

Stream Control Transmission Protocol (SCTP) Network Address Translation
                                Support
                    draft-ietf-tsvwg-natsupp-11.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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 4, 2018.

Stewart, et al.          Expires January 4, 2018                [Page 1]
Internet-Draft              SCTP NAT Support                   July 2017

Copyright Notice

   Copyright (c) 2017 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
   (http://trustee.ietf.org/license-info) in effect on the date of
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   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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