Stream Control Transmission Protocol (SCTP) Network Address Translation
draft-ietf-behave-sctpnat-07

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Document Type Active Internet-Draft (behave WG)
Last updated 2012-10-09
Replaces draft-stewart-behave-sctpnat
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Network Working Group                                         R. Stewart
Internet-Draft                                            Adara Networks
Intended status: BCP                                           M. Tuexen
Expires: April 12, 2013                                     I. Ruengeler
                                        Muenster Univ. of Appl. Sciences
                                                         October 9, 2012

Stream Control Transmission Protocol (SCTP) Network Address Translation
                    draft-ietf-behave-sctpnat-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 or 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 an SCTP specific variant of NAT which
   provides 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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   This Internet-Draft will expire on April 12, 2013.

Copyright Notice

Stewart, et al.          Expires April 12, 2013                 [Page 1]
Internet-Draft                  SCTP NAT                    October 2012

   Copyright (c) 2012 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  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   4.  SCTP NAT Traversal Scenarios . . . . . . . . . . . . . . . . .  4
     4.1.  Single Point Traversal . . . . . . . . . . . . . . . . . .  4
     4.2.  Multi Point Traversal  . . . . . . . . . . . . . . . . . .  5
   5.  Limitations of Classical NAPT for SCTP . . . . . . . . . . . .  6
   6.  The SCTP Specific Variant of NAT . . . . . . . . . . . . . . .  6
   7.  NAT to SCTP  . . . . . . . . . . . . . . . . . . . . . . . . . 11
   8.  Handling of Fragmented SCTP Packets  . . . . . . . . . . . . . 11
   9.  Various Examples of NAT Traversals . . . . . . . . . . . . . . 11
     9.1.  Single-homed Client to Single-homed Server . . . . . . . . 11
     9.2.  Single-homed Client to Multi-homed Server  . . . . . . . . 13
     9.3.  Multihomed Client and Server . . . . . . . . . . . . . . . 15
     9.4.  NAT Loses Its State  . . . . . . . . . . . . . . . . . . . 19
     9.5.  Peer-to-Peer Communication . . . . . . . . . . . . . . . . 21
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 25
   11. Security Considerations  . . . . . . . . . . . . . . . . . . . 25
   12. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 26
   13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 26
     13.1. Normative References . . . . . . . . . . . . . . . . . . . 26
     13.2. Informative References . . . . . . . . . . . . . . . . . . 26
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 26

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