TCP Encapsulation of IKE and IPsec Packets
draft-ietf-ipsecme-tcp-encaps-10

Document Type Active Internet-Draft (ipsecme WG)
Last updated 2017-06-20 (latest revision 2017-05-31)
Replaces draft-pauly-ipsecme-tcp-encaps
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Network                                                         T. Pauly
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                               S. Touati
Expires: December 1, 2017                                       Ericsson
                                                               R. Mantha
                                                           Cisco Systems
                                                            May 30, 2017

               TCP Encapsulation of IKE and IPsec Packets
                    draft-ietf-ipsecme-tcp-encaps-10

Abstract

   This document describes a method to transport IKE and IPsec packets
   over a TCP connection for traversing network middleboxes that may
   block IKE negotiation over UDP.  This method, referred to as TCP
   encapsulation, involves sending both IKE packets for Security
   Association establishment and ESP packets over a TCP connection.
   This method is intended to be used as a fallback option when IKE
   cannot be negotiated over UDP.

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 December 1, 2017.

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
   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

Pauly, et al.           Expires December 1, 2017                [Page 1]
Internet-Draft TCP Encapsulation of IKE and IPsec Packets       May 2017

   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
     1.1.  Prior Work and Motivation . . . . . . . . . . . . . . . .   3
     1.2.  Terminology and Notation  . . . . . . . . . . . . . . . .   4
   2.  Configuration . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  TCP-Encapsulated Header Formats . . . . . . . . . . . . . . .   5
     3.1.  TCP-Encapsulated IKE Header Format  . . . . . . . . . . .   6
     3.2.  TCP-Encapsulated ESP Header Format  . . . . . . . . . . .   6
   4.  TCP-Encapsulated Stream Prefix  . . . . . . . . . . . . . . .   7
   5.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Recommended Fallback from UDP . . . . . . . . . . . . . .   8
   6.  Connection Establishment and Teardown . . . . . . . . . . . .   8
   7.  Interaction with NAT Detection Payloads . . . . . . . . . . .  10
   8.  Using MOBIKE with TCP encapsulation . . . . . . . . . . . . .  10
   9.  Using IKE Message Fragmentation with TCP encapsulation  . . .  11
   10. Considerations for Keep-alives and DPD  . . . . . . . . . . .  11
   11. Middlebox Considerations  . . . . . . . . . . . . . . . . . .  12
   12. Performance Considerations  . . . . . . . . . . . . . . . . .  12
     12.1.  TCP-in-TCP . . . . . . . . . . . . . . . . . . . . . . .  12
     12.2.  Added Reliability for Unreliable Protocols . . . . . . .  13
     12.3.  Quality of Service Markings  . . . . . . . . . . . . . .  13
     12.4.  Maximum Segment Size . . . . . . . . . . . . . . . . . .  13
     12.5.  Tunnelling ECN in TCP  . . . . . . . . . . . . . . . . .  14
   13. Security Considerations . . . . . . . . . . . . . . . . . . .  14
   14. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   15. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  15
   16. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     16.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     16.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Appendix A.  Using TCP encapsulation with TLS . . . . . . . . . .  17
   Appendix B.  Example exchanges of TCP Encapsulation with TLS  . .  17
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