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TCP Encapsulation of IKE and IPsec Packets (RFC8229) Disclosure Number: IPCOM000250640D
Original Publication Date: 2017-Aug-01
Included in the Prior Art Database: 2017-Aug-13
Document File: 50 page(s) / 56K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

T. Pauly: AUTHOR [+2]


The Internet Key Exchange Protocol version 2 (IKEv2) [RFC7296] is a protocol for establishing IPsec Security Associations (SAs), using IKE messages over UDP for control traffic, and using Encapsulating Security Payload (ESP) [RFC4303] messages for encrypted data traffic. Many network middleboxes that filter traffic on public hotspots block all UDP traffic, including IKE and IPsec, but allow TCP connections through because they appear to be web traffic. Devices on these networks that need to use IPsec (to access private enterprise networks, to route Voice over IP calls to carrier networks, or because of security policies) are unable to establish IPsec SAs. This document defines a method for encapsulating IKE control messages as well as IPsec data messages within a TCP connection.

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Internet Engineering Task Force (IETF)                          T. Pauly Request for Comments: 8229                                    Apple Inc. Category: Standards Track                                      S. Touati ISSN: 2070-1721                                                 Ericsson                                                                R. Mantha                                                            Cisco Systems                                                              August 2017

                TCP Encapsulation of IKE and IPsec Packets


   This document describes a method to transport Internet Key Exchange    Protocol (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 Encapsulating    Security Payload (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 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 7841.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

 Pauly, et al.                Standards Track                    [Page 1]
 RFC 8229       TCP Encapsulation of IKE and IPsec Packets    August 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    ( 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.

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