Compression in the Internet Key Exchange Protocol Version 2 (IKEv2)
draft-smyslov-ipsecme-ikev2-compression-03

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Network Working Group                                         V. Smyslov
Internet-Draft                                                ELVIS-PLUS
Intended status: Standards Track                           March 7, 2017
Expires: September 8, 2017

  Compression in the Internet Key Exchange Protocol Version 2 (IKEv2)
               draft-smyslov-ipsecme-ikev2-compression-03

Abstract

   This document describes a method for reducing the size of the IKEv2
   messages by using lossless compression.  Making IKEv2 messages
   smaller is desirable for low power consumption battery powered
   devices.  It also helps to avoid IP fragmentation of IKEv2 messages.
   This document describes how compression is negotiated maintaining
   backward compatibility and how it is used in IKEv2.

Status of This Memo

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   This Internet-Draft will expire on September 8, 2017.

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   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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Smyslov                 Expires September 8, 2017               [Page 1]
Internet-Draft            Compression in IKEv2                March 2017

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol Description  . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Using Compression in the IKE_SA_INIT Exchange . . . . . .   4
     3.2.  Using Compression in Subsequent Exchanges . . . . . . . .   6
   4.  Payload Formats . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Compressed Payload  . . . . . . . . . . . . . . . . . . .   7
     4.2.  INVALID_COMPRESSION_ALGORITHM Notification  . . . . . . .   8
   5.  Interaction with other IKEv2 Extensions . . . . . . . . . . .   8
     5.1.  Interaction with IKEv2 Fragmentation  . . . . . . . . . .   9
     5.2.  Interaction with IKEv2 Resumption . . . . . . . . . . . .   9
     5.3.  Interaction with IKEv2 Redirect . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   The Internet Key Exchange protocol version 2 (IKEv2) defined in
   [RFC7296] is used in the IP Security (IPsec) architecture for the
   purposes of Security Association (SA) parameters negotiation and
   authenticated key exchange.  The protocol uses UDP as the transport
   for its messages.  The size of the IKEv2 messages varies from
   hundreds bytes to several kBytes.

   Sending large UDP messages may cause IP fragmentation to take place,
   which may interact badly with some Network Address Translators (NAT).
   One of the possible solutions to the problem is IKEv2 fragmentation
   described in [RFC7383].  However, the IKEv2 fragmentation cannot be
   used for unencrypted messages and thus cannot be used in the initial
   IKEv2 exchange called IKE_SA_INIT exchange.  Usually the messages of
   the IKE_SA_INIT exchange are relatively small and this restriction
   doesn't cause problems.  However with adoption more and more new
   algorithms and new IKEv2 extensions there is a tendency for these
   messages to become larger and larger for the implementations that
   support new features.
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