UDP Encapsulation of Stream Control Transmission Protocol (SCTP) Packets for End-Host to End-Host Communication
RFC 6951
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RFC - Proposed Standard
(May 2013; No errata)
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2018-12-20
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RFC 6951 (Proposed Standard)
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Martin Stiemerling
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Internet Engineering Task Force (IETF) M. Tuexen
Request for Comments: 6951 Muenster Univ. of Appl. Sciences
Category: Standards Track R. Stewart
ISSN: 2070-1721 Adara Networks
May 2013
UDP Encapsulation of Stream Control Transmission Protocol (SCTP) Packets
for End-Host to End-Host Communication
Abstract
This document describes a simple method of encapsulating Stream
Control Transmission Protocol (SCTP) packets into UDP packets and its
limitations. This allows the usage of SCTP in networks with legacy
NATs that do not support SCTP. It can also be used to implement SCTP
on hosts without directly accessing the IP layer, for example,
implementing it as part of the application without requiring special
privileges.
Please note that this document only describes the functionality
required within an SCTP stack to add on UDP encapsulation, providing
only those mechanisms for two end-hosts to communicate with each
other over UDP ports. In particular, it does not provide mechanisms
to determine whether UDP encapsulation is being used by the peer, nor
the mechanisms for determining which remote UDP port number can be
used. These functions are out of scope for this document.
This document covers only end-hosts and not tunneling (egress or
ingress) endpoints.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6951.
Tuexen & Stewart Standards Track [Page 1]
RFC 6951 UDP Encapsulation of SCTP Packets May 2013
Copyright Notice
Copyright (c) 2013 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
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 . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Portable SCTP Implementations . . . . . . . . . . . . . . 3
3.2. Legacy NAT Traversal . . . . . . . . . . . . . . . . . . 4
4. Unilateral Self-Address Fixing (UNSAF) Considerations . . . . 4
5. SCTP over UDP . . . . . . . . . . . . . . . . . . . . . . . . 4
5.1. Architectural Considerations . . . . . . . . . . . . . . 4
5.2. Packet Format . . . . . . . . . . . . . . . . . . . . . . 5
5.3. Encapsulation Procedure . . . . . . . . . . . . . . . . . 6
5.4. Decapsulation Procedure . . . . . . . . . . . . . . . . . 7
5.5. ICMP Considerations . . . . . . . . . . . . . . . . . . . 7
5.6. Path MTU Considerations . . . . . . . . . . . . . . . . . 7
5.7. Handling of Embedded IP Addresses . . . . . . . . . . . . 8
5.8. Explicit Congestion Notification (ECN) Considerations . . 8
6. Socket API Considerations . . . . . . . . . . . . . . . . . . 8
6.1. Get or Set the Remote UDP Encapsulation Port Number
(SCTP_REMOTE_UDP_ENCAPS_PORT) . . . . . . . . . . . . . . 9
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
8. Security Considerations . . . . . . . . . . . . . . . . . . . 9
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
10.1. Normative References . . . . . . . . . . . . . . . . . . 10
10.2. Informative References . . . . . . . . . . . . . . . . . 11
Tuexen & Stewart Standards Track [Page 2]
RFC 6951 UDP Encapsulation of SCTP Packets May 2013
1. Introduction
This document describes a simple method of encapsulating SCTP packets
into UDP packets. SCTP, as defined in [RFC4960], runs directly over
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