The IPv6 Probe Option
draft-bonica-6man-unrecognized-opt-03

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Last updated 2018-08-09
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6man                                                           R. Bonica
Internet-Draft                                          Juniper Networks
Intended status: Standards Track                                J. Leddy
Expires: February 11, 2019                                       Comcast
                                                         August 10, 2018

                         The IPv6 Probe Option
                 draft-bonica-6man-unrecognized-opt-03

Abstract

   This document defines a new IPv6 option, called the Probe option.
   The Probe option elicits an ICMPv6 Parameter Problem message from all
   nodes that process it.  When a node sends a packet that contains the
   Probe option and receives an ICMPv6 Parameter Problem message in
   response, it has verified the network's ability to convey packets
   that contain the Probe option.

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on February 11, 2019.

Copyright Notice

   Copyright (c) 2018 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
   (https://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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   include Simplified BSD License text as described in Section 4.e of

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   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.  The Probe Option  . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Discovering Network Capabilities  . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   In IPv6 [RFC8200], optional internet-layer information is encoded in
   extension headers.  Two extension headers, the Hop-by-Hop Options
   header and the Destination Options header, contain a variable number
   of options.  Each option contains the following fields:

   o  Option Type

   o  Opt Data Length

   o  Option Data

   The Option Type identifiers are encoded so that their highest-order 2
   bits specify the action to be taken if the processing node does not
   recognize the option.  Encodings follow:

   o  00 - Skip over the option and continue processing the header.

   o  01 - Discard the packet.

   o  10 - Discard the packet and send an ICMPv6 [RFC4443] Parameter
      Problem, Code 2, message to the packet's Source Address, pointing
      to the unrecognized Option Type.

   o  11 - Discard the packet and, only if the packet's Destination
      Address was not a multicast address, send an ICMPv6 Parameter
      Problem, Code 2, message to the packet's Source Address, pointing
      to the unrecognized Option Type.

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   Several upper-layer protocols [RFC6275] [I-D.leddy-6man-truncate]
   emit packets that contain IPv6 destination options.  These protocols
   rely the network to convey packets that contain the IPv6 Destination
   Options header.

   A subset of those protocols emit IPv6 destination options with high-
   order bits equal to "10" and "11".  These IPv6 destination options
   elicit ICMPv6 Parameter Problem messages from destination nodes that
   do not recognize them.  The above-mentioned protocols perform better
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