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Network Working Group                                          R. HindenRequest for Comments: 1897                              Ipsilon NetworksCategory: Experimental                                         J. Postel                                                                     ISI                                                            January 1996IPv6 Testing Address AllocationStatus of this Memo   This document specifies an Experimental protocol for the Internet   community.  This memo does not specify an Internet standard of any   kind.  Discussion and suggestions for improvement are requested.   Distribution of this memo is unlimited.1.0 Introduction   This document describes an allocation plan for IPv6 addresses to be   used in testing IPv6 prototype software.  These addresses are   temporary and will be reclaimed in the future.  Any IPv6 system using   these addresses will have to renumber at some time in the future.   These addresses will not to be routable in the Internet other than   for IPv6 testing.   The addresses described in this document are consistent with the IPv6   Addressing Architecture [ARCH].  They may be assigned to nodes   manually, with IPv6 Auto Address Allocation [AUTO], or with DHCP for   IPv6 [DHCPv6].Hinden & Postel               Experimental                      [Page 1]

RFC 1897            IPv6 Testing Address Allocation         January 19962.0 Address Format   The address format for the IPv6 test address is consistent with the   provider-based unicast address allocation [PRVD] which is as follows:   | 3 |  5 bits  |  16 bits | 8 |   24 bits  | 8 |    64 bits     |   +---+----------+----------+---+------------+---+----------------+   |010|RegistryID|ProviderID|RES|SubscriberID|RES|Intra-Subscriber|   +---+----------+----------+---+------------+---+----------------+   The specific allocation of each field of the test address format is   as follows:   | 3 |  5 bits  |  16 bits | 8 |   24 bits  | 8 | 16 bits|48 bits|   +---+----------+----------+---+------------+---+--------+-------+   |   |          |Autonomous|   |    IPv4    |   | Subnet | Intf. |   |010|  11111   |  System  |RES|   Network  |RES|        |       |   |   |          |  Number  |   |   Address  |   | Address|  ID   |   +---+----------+----------+---+------------+---+--------+-------+   where:   010        This is the Format Prefix used to identify provider-based        unicast addresses.   11111        This is a Registry ID reserved by the IANA.  The initial use of        addresses in this Registry ID for IPv6 testing is temporary.        All users of these addresses will be required to renumber at        some time in the future.   Autonomous System Number        This is the current autonomous system number assigned to the        provider providing internet service to the an IPv6 testers        organization.  For example for IPv6 testers receiving internet        service from BBN Barrnet would use autonomous system number 189.        This would be coded in the autonomous system field of the        address as follows:             0000 0000 1011 1101 (binary)Hinden & Postel               Experimental                      [Page 2]

RFC 1897            IPv6 Testing Address Allocation         January 1996        The values for the autonomous system number of an organization's        provider can be obtained from that provider, or can be looked up        in the "whois" database maintained by the internic.net.   RES        This field is reserved and must be set to zero.   IPv4 Network Address        This is based on the current IPv4 routable address for the        subscriber which the interface is connected.  It is formed by        taking the high order 24 bits of the IPv4 address.  For example        for an IPv4 address (in IPv4 syntax):             IPv4 Address             ------------             39.11.22.1        the value to put in this field of IPv6 address is:             IPv4 Format             Hex             ------------            ------             39.11.22                270B16        This technique for generating values for this field only works        for subscribers which have IPv4 subscriber prefixes less than        equal to 24 bits long.  There may be subscribers using IPv4        addresses with longer subscriber prefixes, but this conflict is        expected to be very rare.  Subscribers with subscriber prefixes        larger than 24 bits should use the remaining bits in the IPv4        prefix as the high order bits in the Subnet Address field.   RES        This field is reserved and must be set to zero.   Subnet Address        The Subnet ID identifies a specific physical link on which the        interface is located.  There can be multiple subnets on the same        physical link.  A specific subnet can not span multiple physical        links.  The assignment of values for this field is left to an        individual subscriber.  One possible algorithm to generate        values for this field is to use the bits in the IPv4 address        which identify the IPv4 subnet.Hinden & Postel               Experimental                      [Page 3]

RFC 1897            IPv6 Testing Address Allocation         January 1996   Interface ID        This is the unique identifier of the interface on the link,        usually the 48-bit IEEE 802 MAC address of the interface if        available.4.0 References  [ARCH]  Hinden, R., and S. Deering, Editors, "IP Version 6          Addressing Architecture",RFC 1884, Ipsilon Networks, Xerox          PARC, December 1995.  [AUTO]  Thomson, S.,"IPv6 Stateless Address Autoconfiguration",          Work in Progress.  [DHCP6] Bound, J.,"Host Configuration Protocol for IPv6", Work          in Progress.  [PROV]  Rekhter, Y., and P. Lothberg, "An IPv6 Provider-Based          Unicast Address Format", Work in Progress.5.0 Security Considerations   Security issues are not discussed in this memo.6.0  Authors' Addresses   Robert M. Hinden   Ipsilon Networks, Inc.   2191 E. Bayshore Road, Suite 100   Palo Alto, CA 94303   USA   Phone: +1 415 846 4604   Fax:   +1 415 855 1414   EMail: hinden@ipsilon.com   Jon Postel   Information Sciences Institute   4676 Admiralty Way   Marina del Rey, CA 90292-6695   USA   Phone: +1 310 822 1511   Fax:   +1 310 823 6714   EMail: postel@isi.eduHinden & Postel               Experimental                      [Page 4]