One document matched: draft-durand-ipv6-address-mapping-00.txt

INTERNET-DRAFT                                                      Alain DURAND
Expires 26/08/1999                                                          IMAG



                            Generic Address Mapping

                     draft-durand-ipv6-address-mapping-00.txt



This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026.

Internet-Drafts are working documents of the Internet Engineering Task Force
(IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html.



Abstract:
---------

	The goal of this proposal is to provide a generic mechanism
	to perform various kind of IPv6 address resolution.
	It is designed to work in a serverless environment.



Introduction:
-------------

	This proposal is largely inspired by draft-ietf-ipngwg-linkname-01.txt
	By Dan Harrington and various discussion with Peter Curran.

	Within sites, nodes may use different addresses from various scopes.
It is sometimes necessary to perform address mapping in between them.

A similar problem is to perform address to name and name to address
mapping in serverless (no DNS running) environment.

The proposed mechanism is inspired by the ARP model of IPv4
and ND of IPv6.

It should be noted that this mechanism is voluntarily limited
to site local scope and should not be used on the global Internet. 



Mechanism:
----------

	A node willing to perform such a resolution send a multicast
	query to a (to be defined) site local group.

	A node in this multicast group whose IP address or name is
	requested SHOULD send back to the source a unicast packet
	containing the requested information.
	
	Node receiving replies may cache those data for a limited time
	not exceeding the TTL value.

The periodic "advertisement" mechanism of the original proposal
has been abandoned.  



Packet format:
--------------

      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Version    |  Direction    |    T Y P E    |  L E N G T H  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | S e q u e n c e   N u m b e r |             T T L             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | D A T A . . .                                                 |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Version : 1

Direction :
	0 : Request
	1 : Reply

TYPE :

	0x01 : Name to Link Local Address
	0x02 : Name to Site Local Address
	0x03 : Name to Global Address
	0x04 : Name to Preferred Scope Address

	0x10 : Link Local Address to Name
	0x12 : Link Local Address to Site Local Address
	0x13 : Link Local Address to Global Address
	0x14 : Link Local Address to Preferred Scope Address

	0x20 : Site Local Address to Name
	0x21 : Site Local Address to Link Local Address
	0x23 : Site Local Address to Global Address
	0x24 : Site Local Address to Preferred Scope Address

	0x30 : Global Address to Name
	0x31 : Global Address to Link Local Address
	0x32 : Global Address to site Local Address
	0x34 : Global Address to Preferred Scope Address

	0x40 : Preferred Address to Name
	0x41 : Preferred Address to Name
	0x42 : Preferred Address to Site Local Address
	0x43 : Preferred Address to Global Address

LENGTH : packet length in 64 bit words

Sequence Number : Random ID. The reply MUST match the query sequence number.

TTL :
In query packets: MBZ
In reply packets:
The time the provided information may be cached, in second.
      0x0000 means don't cache
	0xFFFF means infinity

DATA : This field is initialized according to the TYPE field.

If the DATA field length in bits is not a multiple of 64, padding
with 0 must occurred.



Security Consideration:
-----------------------

This mechanism is neither more nor less secure than the ICMP one.
Limiting the scope of this mechanism to site may somehow lower the risks,
However is should be used with caution in high security environment.
This mechanism is just a part of a more global picture including plug & play
and auto-configuration.



Y2K Consideration:
------------------

None



Author address:
---------------

Alain Durand
IMAG
BP 53
38041 GRENOBLE CEDEX 9
Tel: +33 4 76 63 57 03
Fax: +33 4 76 51
Mail: Alain.Durand@imag.fr

                                                         Expires: 26/08/1999