Network Working Group N. Matsuhira Internet-Draft Fujitsu Limited Intended status: Standards Track July 23, 2014 Expires: January 24, 2015 SA46T Prefix Translator (SA46T-PT) draft-matsuhira-sa46t-pt-spec-03 Abstract This document specifies SA46T Prefix Translator (SA46T-PT) specification. SA46T-PT expand IPv4 network plane by connecting SA46T domain and SA46T-PR domain. SA46T-PT translate prefix part of SA46T address and SA46T-PR address both are IPv6 address. SA46T-PT does not translate IPv4 packet which is encapsulated, so transparency of IPv4 packet is not broken. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 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 http://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 January 24, 2015. Copyright Notice Copyright (c) 2014 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 Matsuhira Expires January 24, 2015 [Page 1] Internet-Draft SA46T-PT July 2014 (http://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 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Basic Network Configuration . . . . . . . . . . . . . . . . . 3 3. Basic function of SA46T-PT . . . . . . . . . . . . . . . . . . 4 3.1. Translation processing . . . . . . . . . . . . . . . . . . 5 3.2. Address format of SA46T and SA46T-PR . . . . . . . . . . . 5 3.3. Resolving translate prefix . . . . . . . . . . . . . . . . 6 3.4. Destination address resolution . . . . . . . . . . . . . . 6 3.5. Source address resolution . . . . . . . . . . . . . . . . 7 4. Sample Configuration . . . . . . . . . . . . . . . . . . . . . 7 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 6. Security Considerations . . . . . . . . . . . . . . . . . . . 9 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 9 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10 8.1. Normative References . . . . . . . . . . . . . . . . . . . 10 8.2. Informative References . . . . . . . . . . . . . . . . . . 10 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 10 Matsuhira Expires January 24, 2015 [Page 2] Internet-Draft SA46T-PT July 2014 1. Introduction This document provide SA46T Prefix Translator (SA46T-PT) specification. The basic strategy for IPv6 deployment is dual stack. However, because of exhaustion of IPv4 address, there will be no IPv4 addresses for configuring dual stack in near future. That means there will be IPv6 only networks automatically. However, there are many IPv4 only networks still exist and those seems continuous use in near future. That means methods continuous use of IPv4 network over IPv6 only network will be required. SA46T [I-D.draft-matsuhira-sa46t-spec] provide such methods. In addition, SA46T-PR [I-D.draft-matsuhira-sa46t-pr-spec] also provide such methots. SA46T is backbone network based approach, on the other hand, SA46T-PR is stub network based approach. SA46T-PT expand IPv4 network plane by connecting SA46T domain and SA46T-PR domain. SA46T-PT translate prefix part of SA46T address and SA46T-PR address both are IPv6 address. SA46T-PT does not translate IPv4 packet which is encapsulated, so transparency of IPv4 packet is not broken. 2. Basic Network Configuration Figure 1 shows network configuration with SA46T-PT. At large view, the network consists three parts, SA46T domain, SA46T-PR domain, and SA46T-PT. SA46T-PT connect SA46T domain and SA46T-PR domain. Matsuhira Expires January 24, 2015 [Page 3] Internet-Draft SA46T-PT July 2014 <------ SA46T Domain ------------> <--------- SA46T-PR Domain ----> /-------------------------------/ /-----------------------------\ | | | | | Backbone Network +----------+ Backbone Network | | | SA46T-PT | | | +----------+ | | +----------+ +----------+ | | | \---| SA46T |--| SA46T |--/ /-----------------------------/ +----------+ +----------+ | | | | | | | | | | | | +----------+ +----------+ /--------------\/--------------/ /-| SA46T-PR |-\/-| SA46T-PR |-\ | || | | +----------+ || +----------+ | | || | | || | | Stub Network || Stub Network | | Stub Network || Stub Network | | || | | (IPv4 only) || (Dual Stack) | | || | | || | \--------------//--------------/ \--------------/\--------------/ Figure 1 SA46T domain consists three parts, backbone network, stub network and SA46T. Backbone network can be operated with IPv6 only. Stub network has three cases, IPv4 only, Dual Stack (both IPv4 and IPv6), and IPv6 only.SA46T connects backbone network and stub network in case IPv4 still works in that stub network. If stub network is IPv6 only, SA46T is not needed. SA46T is a backbone network based approach, that mean SA46T advertise special route for SA46T. And also, SA46T-PR domain consists three parts, backbone network, stub network and SA46T. Backbone network can be operated with IPv6 only. Stub network has three cases, IPv4 only, Dual Stack (both IPv4 and IPv6), and IPv6 only.SA46T connects backbone network and stub network in case IPv4 still works in that stub network. If stub network is IPv6 only, SA46T-PR is not needed. SA46T-PR is a stub network based approach. 3. Basic function of SA46T-PT This section describe basic function of SA46T-PT. Matsuhira Expires January 24, 2015 [Page 4] Internet-Draft SA46T-PT July 2014 3.1. Translation processing SA46T-PT translate between SA46T packet and SA46T-PT packet. SA46T packet and SA46T-PT packet are almost the same, however IPv6 address are different. Fig shows packet format of SA46T domain and SA46T-PT domain. +--------+--------+------------+ +--------+--------+------------+ |IPv6 Hdr|IPv4 Hdr| Data | --> |IPv6 Hdr|IPv4 Hdr| Data | +--------+--------+------------+ +--------+--------+------------+ +--------+--------+------------+ +--------+--------+------------+ |IPv6 Hdr|IPv4 Hdr| Data | <-- |IPv6 Hdr|IPv4 Hdr| Data | +--------+--------+------------+ +--------+--------+------------+ /-------------------\ +----------+ /---------------------------\ | SA46T Domain |--| SA46T-PT |--| SA46T-PR Domain | | | +----------+ | | \-------------------/ \---------------------------/ Figure 2 3.2. Address format of SA46T and SA46T-PR figure Figure 3 shows SA46T address format and Figure 4 shows SA46T-PR address format. These format almost the same except SA46T address prefix in SA46T address and SA46T-PR address prefix in SA46T-PR address. | 96 - m bits | m bits | 32 bits | +--------------------------+------------------------+--------------+ | SA46T address prefix | IPv4 network plane ID | IPv4 address | +--------------------------+------------------------+--------------+ Figure 3 | 96 - m bits | m bits | 32 bits | +--------------------------+------------------------+--------------+ | SA46T-PR address prefix | IPv4 network plane ID | IPv4 address | +--------------------------+------------------------+--------------+ Figure 4 Matsuhira Expires January 24, 2015 [Page 5] Internet-Draft SA46T-PT July 2014 3.3. Resolving translate prefix SA46T-PT translate from SA46T prefix to SA46T-PR prefix, or from SA46T-PR prefix to SA46T prefix using SA46T Prefix Translation (SA46T-PT) table. fig Figure 5shows address resolution manner and fig Figure 6shows SA46T-PT table. | 96 - m bits | m bits | 32 bits | +--------------------------+------------------------+--------------+ | SA46T / SA46T-PR prefix | IPv4 network plane ID | IPv4 address | +--------------------------+------------------------+--------------+ \--------------------------/\--------------------------------------/ ^ | | | | v +------------------------------------------------------------------+ | | | SA46T Prefix Translation Table (SA46T-PT Table) | | | +------------------------------------------------------------------+ Figure 5 SA46T-AT table is similar with SA46T-PR table, however SA46T-AT table may contain SA46T prefix. +---------------------+------------+-------++-----------------------+ |IPv4 network plane ID|IPv4 address|netmask||SA46T-PR address prefix| +---------------------+------------+-------++-----------------------+ |IPv4 network plane ID|IPv4 address|netmask||SA46T-PR address prefix| +---------------------+------------+-------++-----------------------+ |IPv4 network plane ID|IPv4 address|netmask||SA46T-PR address prefix| +---------------------+------------+-------++-----------------------+ |IPv4 network plane ID|IPv4 address|netmask||SA46T-PR address prefix| +---------------------+------------+-------++-----------------------+ : : : +---------------------+------------+-------++-----------------------+ |IPv4 network plane ID|IPv4 address|netmask||SA46T-PR address prefix| +---------------------+------------+-------++-----------------------+ Figure 6 3.4. Destination address resolution For address resolution for destination address, SA46T-PT use SA46T-PT table. Matsuhira Expires January 24, 2015 [Page 6] Internet-Draft SA46T-PT July 2014 3.5. Source address resolution For address resolution for source address, SA46T-PT use interface information, not SA46T-PT table. From SA46T domain to SA46T-PR domain, SA46T-PT use IPv6 address prefix of the interface which belong SA46T-PR domain. From 4. Sample Configuration Figure Figure 7shows sample confiuration of SA46T-PT. In this example, there are four IPv4 stub network with the same IPv4 network plane, and two of four are in SA46T domain and other two of four are in SA46T-PR domain. In this example, SA46T prefix is 2001:0db8:0:46::/64. Matsuhira Expires January 24, 2015 [Page 7] Internet-Draft SA46T-PT July 2014 /------------\ | +--------+ /----------------------\ | Backbone | | |Stub Network#1 | | Network |SA46T |--|10.1.1.0/24(plane 1) | |(IPv6 only)| | |2001:0db8:1:1::/64 | | +--------+ \----------------------/ | <--[2001:0db8:1:1::/64] | <--[2001:0db8:0:46:0:1:10.1.1.0/120] | | | +--------+ /----------------------\ | | | |Stub Network#2 | | |SA46T |--|10.1.2.0/24(plane 1) | | | | |2001:0db8:1:2::/64 | | +--------+ \----------------------/ | <--[2001:0db8:1:2::/64] | <--[2001:0db8:0:46:0:1:10.1.2.0/120] | | | <--[2001:0db8:0:46:0:1:10.1.4.0/120] | <--[2001:0db8:0:46:0:1:10.1.5.0/120] | +------------+ | | SA46T-PT | | +------------+ \------------/ | | |Stub Network #0 /------------\ | 2001:0db8:2:0::/64 | |----+ | | /--------------------------------------/ | | | Stub Network #3 | | | | 2001:0db8:2:1::/64 | | | | +--------+ /----------------------\ | | |--| |SA46T-PR|--|10.1.3.0/24(plane 1) | | | | | +--------+ /----------------------/ | | <--[2001:0db8:2:1::/64] | | | /--------------------------------------/ | | | | /--------------------------------------/ | | | Stub Network #4 | | | | 2001:0db8:2:2::/64 | | Backbone | | +--------+ /----------------------\ | | Network |--| |SA46T-PR|--|10.1.4.0/24(plane 1) | | | | | +--------+ \----------------------/ | | <--[2001:0db8:2:2::/64] | | | /--------------------------------------/ \------------/ Figure 7 Matsuhira Expires January 24, 2015 [Page 8] Internet-Draft SA46T-PT July 2014 Figure Figure 8 shows SA46T-PT table for this example. This example is default free case. +---------------------+------------+-------++-----------------------+ |IPv4 network plane ID|IPv4 address|netmask||SA46T-PR address prefix| +---------------------+------------+-------++-----------------------+ | 1 | 10.1.1.0 | /120 || 2001:0db8:0:46 | | 1 | 10.1.2.0 | /120 || 2001:0db8:0:46 | | 1 | 10.1.3.0 | /120 || 2001:0db8:2:1 | | 1 | 10.1.4.0 | /120 || 2001:0db8:2:2 | +---------------------+------------+-------++-----------------------+ Figure 8 Fig Figure 9shows another SA46T-PT table for this example. This example use default for SA46T. If there are many stub network in SA46T domain, by using default as SA46T prefix, reduction of SA46T-PT table size can be possible. +---------------------+------------+-------++-----------------------+ |IPv4 network plane ID|IPv4 address|netmask||SA46T-PR address prefix| +---------------------+------------+-------++-----------------------+ | 1 | 10.1.3.0 | /120 || 2001:0db8:2:1 | | 1 | 10.1.4.0 | /120 || 2001:0db8:2:2 | | 1 | 0.0.0.0 | /0 || 2001:0db8:0:46 | +---------------------+------------+-------++-----------------------+ Figure 9 5. IANA Considerations This document makes no request of IANA. Note to RFC Editor: this section may be removed on publication as an RFC. 6. Security Considerations Security Considerations does not discussed in this memo. 7. Acknowledgements 8. References Matsuhira Expires January 24, 2015 [Page 9] Internet-Draft SA46T-PT July 2014 8.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. 8.2. Informative References [I-D.draft-matsuhira-sa46t-pr-spec] Matsuhira, N., "SA46T Prefix Resolution (SA46T-PR)", January 2014. [I-D.draft-matsuhira-sa46t-spec] Matsuhira, N., "Stateless Automatic IPv4 over IPv6 Encapsulation / Decapsulation Technology: Specification", January 2014. Author's Address Naoki Matsuhira Fujitsu Limited 1-1, Kamikodanaka 4-chome, Nakahara-ku Kawasaki, 211-8588 Japan Phone: +81-44-754-3466 Fax: Email: matsuhira@jp.fujitsu.com Matsuhira Expires January 24, 2015 [Page 10]