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+Network Working Group Assar Westerlund
+<draft-ietf-cat-krb5-ipv6.txt> SICS
+Internet-Draft October, 1997
+Expire in six months
+
+ Kerberos over IPv6
+
+Status of this Memo
+
+ This document is an Internet-Draft. 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."
+
+ To view the entire list of current Internet-Drafts, please check the
+ "1id-abstracts.txt" listing contained in the Internet-Drafts Shadow
+ Directories on ftp.is.co.za (Africa), ftp.nordu.net (Europe),
+ munnari.oz.au (Pacific Rim), ds.internic.net (US East Coast), or
+ ftp.isi.edu (US West Coast).
+
+ Distribution of this memo is unlimited. Please send comments to the
+ <cat-ietf@mit.edu> mailing list.
+
+Abstract
+
+ This document specifies the address types and transport types
+ necessary for using Kerberos [RFC1510] over IPv6 [RFC1883].
+
+Specification
+
+ IPv6 addresses are 128-bit (16-octet) quantities, encoded in MSB
+ order. The type of IPv6 addresses is twenty-four (24).
+
+ The following addresses (see [RFC1884]) MUST not appear in any
+ Kerberos packet:
+
+ the Unspecified Address
+ the Loopback Address
+ Link-Local addresses
+
+ IPv4-mapped IPv6 addresses MUST be represented as addresses of type
+ 2.
+
+
+
+
+Westerlund [Page 1]
+
+Internet Draft Kerberos over IPv6 October, 1997
+
+
+ Communication with the KDC over IPv6 MUST be done as in section 8.2.1
+ of [RFC1510].
+
+Discussion
+
+ [RFC1510] suggests using the address family constants in
+ <sys/socket.h> from BSD. This cannot be done for IPv6 as these
+ numbers have diverged and are different on different BSD-derived
+ systems. [RFC2133] does not either specify a value for AF_INET6.
+ Thus a value has to be decided and the implementations have to
+ convert between the value used in Kerberos HostAddress and the local
+ AF_INET6.
+
+ There are a few different address types in IPv6, see [RFC1884]. Some
+ of these are used for quite special purposes and it makes no sense to
+ include them in Kerberos packets.
+
+ It is necessary to represent IPv4-mapped addresses as Internet
+ addresses (type 2) to be compatible with Kerberos implementations
+ that only support IPv4.
+
+Security considerations
+
+ This memo does not introduce any known security considerations in
+ addition to those mentioned in [RFC1510].
+
+References
+
+ [RFC1510] Kohl, J. and Neuman, C., "The Kerberos Network
+ Authentication Service (V5)", RFC 1510, September 1993.
+
+ [RFC1883] Deering, S., Hinden, R., "Internet Protocol, Version 6
+ (IPv6) Specification", RFC 1883, December 1995.
+
+ [RFC1884] Hinden, R., Deering, S., "IP Version 6 Addressing
+ Architecture", RFC 1884, December 1995.
+
+ [RFC2133] Gilligan, R., Thomson, S., Bound, J., Stevens, W., "Basic
+ Socket Interface Extensions for IPv6", RFC2133, April 1997.
+
+Author's Address
+
+ Assar Westerlund
+ Swedish Institute of Computer Science
+ Box 1263
+ S-164 29 KISTA
+ Sweden
+
+
+
+
+Westerlund [Page 2]
+
+Internet Draft Kerberos over IPv6 October, 1997
+
+
+ Phone: +46-8-7521526
+ Fax: +46-8-7517230
+ EMail: assar@sics.se
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+Westerlund [Page 3]
+