UDP Encapsulation of SCTP Packets
draft-ietf-tsvwg-sctp-udp-encaps-02
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Network Working Group M. Tuexen
Internet-Draft Muenster Univ. of Appl. Sciences
Intended status: Standards Track R. Stewart
Expires: June 10, 2012 Adara Networks
December 8, 2011
UDP Encapsulation of SCTP Packets
draft-ietf-tsvwg-sctp-udp-encaps-02.txt
Abstract
This document describes a simple method of encapsulating SCTP Packets
into UDP packets and its limitations. This allows the usage of SCTP
in networks with legacy NAT not supporting 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.
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 http://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 June 10, 2012.
Copyright Notice
Copyright (c) 2011 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
Tuexen & Stewart Expires June 10, 2012 [Page 1]
Internet-Draft UDP Encapsulation of SCTP Packets December 2011
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. SCTP over UDP . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. Architectural Considerations . . . . . . . . . . . . . . . 4
4.2. Packet Format . . . . . . . . . . . . . . . . . . . . . . 4
4.3. Encapsulation Procedure . . . . . . . . . . . . . . . . . 6
4.4. Decapsulation Procedure . . . . . . . . . . . . . . . . . 6
4.5. ICMP considerations . . . . . . . . . . . . . . . . . . . 6
4.6. Path MTU considerations . . . . . . . . . . . . . . . . . 7
4.7. Handling of Embedded IP-addresses . . . . . . . . . . . . 7
4.8. ECN considerations . . . . . . . . . . . . . . . . . . . . 7
5. Socket API Considerations . . . . . . . . . . . . . . . . . . 7
5.1. Get or Set the Remote UDP Encapsulation Port Number
(SCTP_REMOTE_UDP_ENCAPS_PORT) . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
7. Security Considerations . . . . . . . . . . . . . . . . . . . 8
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 8
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 8
9.1. Normative References . . . . . . . . . . . . . . . . . . . 8
9.2. Informative References . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10
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Internet-Draft UDP Encapsulation of SCTP Packets December 2011
1. Introduction
This document describes a simple method of encapsulating SCTP packets
into UDP packets. SCTP as defined in [RFC4960] runs directly over
IPv4 or IPv6. There are two main reasons for encapsulating SCTP
packets:
o Allow SCTP traffic to pass legacy NATs, which do not provide
native SCTP support as specified in [I-D.ietf-behave-sctpnat] and
[I-D.ietf-tsvwg-natsupp].
o Allow SCTP to be implemented on hosts which do not provide direct
access to the IP-layer. In particular, applications can use their
own SCTP implementation if the operating system does not provide
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