Default IPv6 Local Only Addressing for Non-Internet Devices
draft-smith-v6ops-local-only-addressing-00

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Last updated 2019-10-14
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Internet Engineering Task Force                                 M. Smith
Internet-Draft                                          October 14, 2019
Intended status: Informational
Expires: April 16, 2020

      Default IPv6 Local Only Addressing for Non-Internet Devices
               draft-smith-v6ops-local-only-addressing-00

Abstract

   For certain types or models of devices it should be clear and obvious
   that, by default, they should not be reachable from the global IPv6
   Internet, or able to reach the global IPv6 Internet, even though the
   network they are attached to provides global IPv6 Internet
   connectivity.  This memo proposes that these types of devices refuse
   to configure and use global IPv6 Internet addresses by default.

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 https://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 April 16, 2020.

Copyright Notice

   Copyright (c) 2019 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
   to this document.  Code Components extracted from this document must
   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
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Default Local Only Addresses  . . . . . . . . . . . . . . . .   3
   3.  SLAAC Address Configuration . . . . . . . . . . . . . . . . .   3
   4.  DHCPv6 Address Configuration  . . . . . . . . . . . . . . . .   4
   5.  Permitted Incoming and Outgoing Connections . . . . . . . . .   5
   6.  Example Device Types  . . . . . . . . . . . . . . . . . . . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   9.  Change Log [RFC Editor please remove] . . . . . . . . . . . .   6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   For some types of IPv6 devices, their access to the Internet, and
   access from the Internet, should be prevented under normal
   circumstances.  Examples of these types of devices are network
   attached paper printers, local network file and print servers, and
   various types of "Internet of Things" devices.

   As a basic and fundamental prevention measure, these types of devices
   can have their ability to reach the Internet, or to be reachable from
   the Internet, prevented by only attaching them to local network links
   and routers that only support and provide Unique Local Unicast
   Addresses (ULA) [RFC4193].  These nodes and devices would then only
   have addresses from within the Link-Local [RFC4291] prefix and ULA
   prefix(es) available on the link.

   In some networks, it may not be possible or easy to use "ULA Only"
   links to isolate these devices.  For example, these devices may need
   to be attached to the same link as other devices that do have global
   IPv6 addresses and can reach the Internet.  This may be because these
   local network only devices may need to be discoverable by devices
   with global Internet addresses via link-only discovery protocols such
   as multicast DNS (mDNS) [RFC6762].

   This memo proposes that when it is clear to a device manufacturer
   that a device should be isolated from the Internet by default, due
   its functions and role, the device only configures Link-Local
   Addresses and non-Internet usable addresses such as ULAs on its

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