Using compression in the Internet Key Exchange Protocol Version 2 (IKEv2)
draft-smyslov-ipsecme-ikev2-compression-10

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Network Working Group                                         V. Smyslov
Internet-Draft                                                ELVIS-PLUS
Intended status: Standards Track                       September 1, 2020
Expires: March 5, 2021

   Using compression in the Internet Key Exchange Protocol Version 2
                                (IKEv2)
               draft-smyslov-ipsecme-ikev2-compression-10

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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   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Smyslov                   Expires March 5, 2021                 [Page 1]
Internet-Draft            Compression in IKEv2            September 2020

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology and Notation  . . . . . . . . . . . . . . . . . .   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
     5.4.  Interaction with IKEv2 Puzzles  . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  12

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 a 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,
   that would 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 (IKE_SA_INIT).  Usually the
   IKE_SA_INIT messages are relatively small and this restriction
   doesn't cause problems.  However with adoption of more and more new
   algorithms and new IKEv2 extensions there is a tendency for these
   messages to grow up in size.

   The lossless compression can be used to reduce the size of the IKEv2