Additional Considerations for UDP Encapsulation of Stream Control Transmission Protocol (SCTP) Packets
draft-tuexen-tsvwg-sctp-udp-encaps-cons-02

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Network Working Group                                          M. Tuexen
Internet-Draft                          Muenster Univ. of Appl. Sciences
Updates: 6951 (if approved)                                   R. Stewart
Intended status: Standards Track                           Netflix, Inc.
Expires: January 4, 2018                                    July 3, 2017

   Additional Considerations for UDP Encapsulation of Stream Control
                  Transmission Protocol (SCTP) Packets
             draft-tuexen-tsvwg-sctp-udp-encaps-cons-02.txt

Abstract

   RFC 6951 specifies the UDP encapsulation of SCTP packets.  The
   described handling of received packets requires the check of the
   verification tag.  However, RFC 6951 misses a specification for the
   handling of received packets for which this check is not possible.

   This document updates RFC 6951 by specifying the handling of received
   packets where the verification tag can not be checked.

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 January 4, 2018.

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
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   (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

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   to this document.  Code Components extracted from this document must
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Handling of Out of the Blue Packets . . . . . . . . . . . . .   3
   4.  Handling of SCTP Packets Containing an INIT Chunk Matching an
       Existing Association  . . . . . . . . . . . . . . . . . . . .   3
   5.  Middlebox Considerations  . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   [RFC6951] specifies the UDP encapsulation of SCTP packets.  To be
   able to adopt automatically to changes of the remote UDP
   encapsulation port number, it is updated automatically when
   processing received packets.  This includes automatic enabling and
   disabling of UDP encapsulation.

   Section 5.4 of [RFC6951] describes the processing of received packets
   and requires the check of the verification tag before updating the
   remote UDP encapsulation port and the possible enabling or disabling
   of UDP encapsulation.

   [RFC6951] basically misses a description for the handling of received
   packets where this verification tag check is not possible.  This
   includes packets for which no association can be found and packets
   containing an INIT chunk, since the verification tag for these
   packets must be 0.

2.  Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

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3.  Handling of Out of the Blue Packets
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