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-.pl 10.0i
-.po 0
-.ll 7.2i
-.lt 7.2i
-.nr LL 7.2i
-.nr LT 7.2i
-.ds LF Westerlund, Danielsson
-.ds RF [Page %]
-.ds CF
-.ds LH Internet Draft
-.ds RH November, 1997
-.ds CH Kerberos over TCP
-.hy 0
-.ad l
-.in 0
-.ta \n(.luR
-.nf
-Network Working Group Assar Westerlund
-<draft-ietf-cat-krb5-tcp.txt> SICS
-Internet-Draft Johan Danielsson
-November, 1997 PDC, KTH
-Expire in six months
-.fi
-
-.ce
-Kerberos over TCP
-
-.ti 0
-Status of this Memo
-
-.in 3
-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.
-
-.ti 0
-Abstract
-
-.in 3
-This document specifies how the communication should be done between a
-client and a KDC using Kerberos [RFC1510] with TCP as the transport
-protocol.
-
-.ti 0
-Specification
-
-This draft specifies an extension to section 8.2.1 of RFC1510.
-
-A Kerberos server MAY accept requests on TCP port 88 (decimal).
-
-The data sent from the client to the KDC should consist of 4 bytes
-containing the length, in network byte order, of the Kerberos request,
-followed by the request (AS-REQ or TGS-REQ) itself. The reply from
-the KDC should consist of the length of the reply packet (4 bytes,
-network byte order) followed by the packet itself (AS-REP, TGS-REP, or
-KRB-ERROR).
-
-.nf
-C->S: Open connection to TCP port 88 at the server
-C->S: length of request
-C->S: AS-REQ or TGS-REQ
-S->C: length of reply
-S->C: AS-REP, TGS-REP, or KRB-ERROR
-.fi
-
-.ti 0
-Discussion
-
-Even though the preferred way of sending kerberos packets is over UDP
-there are several occasions when it's more practical to use TCP.
-
-Mainly, it's usually much less cumbersome to get TCP through firewalls
-than UDP.
-
-In theory, there's no reason for having explicit length fields, that
-information is already encoded in the ASN1 encoding of the Kerberos
-packets. But having explicit lengths makes it unnecessary to have to
-decode the ASN.1 encoding just to know how much data has to be read.
-
-Another way of signaling the end of the request of the reply would be
-to do a half-close after the request and a full-close after the reply.
-This does not work well with all kinds of firewalls.
-
-.ti 0
-Security considerations
-
-.in 3
-This memo does not introduce any known security considerations in
-addition to those mentioned in [RFC1510].
-
-.ti 0
-References
-
-.in 3
-[RFC1510] Kohl, J. and Neuman, C., "The Kerberos Network
-Authentication Service (V5)", RFC 1510, September 1993.
-
-.ti 0
-Authors' Addresses
-
-Assar Westerlund
-.br
-Swedish Institute of Computer Science
-.br
-Box 1263
-.br
-S-164 29 KISTA
-.br
-Sweden
-
-Phone: +46-8-7521526
-.br
-Fax: +46-8-7517230
-.br
-EMail: assar@sics.se
-
-Johan Danielsson
-.br
-PDC, KTH
-.br
-S-100 44 STOCKHOLM
-.br
-Sweden
-
-Phone: +46-8-7907885
-.br
-Fax: +46-8-247784
-.br
-EMail: joda@pdc.kth.se