Stream Control Transmission Protocol (SCTP) Network Address Translation Support
draft-ietf-tsvwg-natsupp-07

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Document Type Active Internet-Draft (tsvwg WG)
Last updated 2015-02-25
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Send notices to tsvwg-chairs@ietf.org, draft-ietf-tsvwg-natsupp@ietf.org
Network Working Group                                         R. Stewart
Internet-Draft                                             Netflix, Inc.
Intended status: Standards Track                               M. Tuexen
Expires: August 29, 2015                                    I. Ruengeler
                                        Muenster Univ. of Appl. Sciences
                                                       February 25, 2015

Stream Control Transmission Protocol (SCTP) Network Address Translation
                                Support
                    draft-ietf-tsvwg-natsupp-07.txt

Abstract

   Stream Control Transmission Protocol [RFC4960] provides a reliable
   communications channel between two end-hosts in many ways similar to
   TCP [RFC0793].  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).  To date, specialized code for SCTP has not yet
   been added to most NATs so that only pure NAT is available.  The end
   result of this is that only one SCTP capable host can be behind a
   NAT.

   This document describes the protocol extensions required for the SCTP
   endpoints to help NATs 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 August 29, 2015.

Stewart, et al.          Expires August 29, 2015                [Page 1]
Internet-Draft              SCTP NAT Support               February 2015

Copyright Notice

   Copyright (c) 2015 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   4
   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  . . . . . . . . .   7
     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  . . . . . . . . . . . . . . . .  12
     5.2.  New Error Causes  . . . . . . . . . . . . . . . . . . . .  13
       5.2.1.  VTag and Port Number Collision Error Cause  . . . . .  13
       5.2.2.  Missing State Error Cause . . . . . . . . . . . . . .  13
       5.2.3.  Port Number Collision Error Cause . . . . . . . . . .  14
     5.3.  New Parameters  . . . . . . . . . . . . . . . . . . . . .  14
       5.3.1.  Disable Restart Parameter . . . . . . . . . . . . . .  14
       5.3.2.  VTags Parameter . . . . . . . . . . . . . . . . . . .  15
   6.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     6.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .  16
     6.2.  Association Setup Considerations  . . . . . . . . . . . .  17
     6.3.  Handling of Internal Port Number and Verification Tag
           Collisions  . . . . . . . . . . . . . . . . . . . . . . .  17
     6.4.  Handling of Internal Port Number Collisions . . . . . . .  18
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