draft-ietf-dhc-suboptions-kdc-serveraddress-02.txt   draft-ietf-dhc-suboptions-kdc-serveraddress-03.txt 
INTERNET-DRAFT K. Luehrs INTERNET-DRAFT K. Luehrs
Dynamic Host Configuration Working Group CableLabs Dynamic Host Configuration Working Group CableLabs
Expires June 2003 R. Woundy Expires August 2003 R. Woundy
AT&T Broadband Comcast Cable
J. Bevilacqua J. Bevilacqua
YAS Corporation YAS Corporation
December 2002 February 2003
KDC Server Address Sub-option KDC Server Address Sub-option
<draft-ietf-dhc-suboptions-kdc-serveraddress-02.txt> <draft-ietf-dhc-suboptions-kdc-serveraddress-03.txt>
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
skipping to change at page 2, line ? skipping to change at page 2, line ?
reference material or to cite them other than as "work in progress." reference material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
Copyright Notice Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved. Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract Abstract
This document defines a new sub-option for the CableLabs Client This document defines a new sub-option for the CableLabs Client
Configuration (CCC) DHCP option code for conveying the network Configuration (CCC) DHCP option code for conveying the network
addresses of Key Distribution Center (KDC) servers. addresses of Key Distribution Center (KDC) servers.
1. Introduction 1. Introduction
The need for a CCC DHCP Option code is described in [1]. The CCC A CCC DHCP Option code providing the KDC server address will be
DHCP option code will be used to address specific needs of CableLabs needed for CableHome-compliant residential gateways configured to
client devices during their configuration processes. This document use Kerberos for authentication as the first step in establishing
proposes a sub-option for the CCC DHCP option. a secure SNMPv3 link between the PS and the SNMP entity in the
cable operator's data network.
Luehrs, Woundy, & Bevilacqua Expires June 2003 [Page 1] Internet Draft KDC Server Address Sub-option December 2002 The CCC DHCP option code will be used to address specific needs of
CableLabs client devices during their configuration processes. This
document proposes a sub-option for the CCC DHCP option.
Luehrs, Woundy, & Bevilacqua Expires August 2003 [Page 1] Internet Draft KDC Server Address Sub-option February 2003
Configuration of a class of CableLabs client devices described in Configuration of a class of CableLabs client devices described in
[2] requires a DHCP sub-option to provide the client with the [2] will require a DHCP sub-option to provide the client with the
network address of a KDC server in the cable operator's data network address of a KDC server in the cable operator's data
network. The class of devices assumed in [2] is unlike the class network. The class of devices assumed in [2] is unlike the class
of devices considered in [1], which perform a DNS lookup of the of devices considered in [1], which perform a DNS lookup of the
Kerberos Realm name to find the KDC server network address. Kerberos Realm name to find the KDC server network address.
This document proposes a sub-option of the CCC DHCP option This document proposes a sub-option of the CCC DHCP option
code for use with CableLabs client devices. The proposed sub-option code for use with CableLabs client devices. The proposed sub-option
encodes an identifier for the network address of each of one or more encodes an identifier for the network address of each of one or more
Key Distribution Center servers with which the CableLabs client Key Distribution Center servers with which the CableLabs client
device exchanges security information. device exchanges security information.
CableLabs plans to assign sub-option code ranges for the CCC option
according to CableLabs projects. The range (51 - 100) is assigned
to the CableHome project. Use of the initial value of this range is
specified in [2].
The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT" and "MAY" The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT" and "MAY"
in this document are to be interpreted as described in RFC 2119 [3]. in this document are to be interpreted as described in RFC 2119 [3].
2. Key Distribution Center IP Address Sub-option 2. Key Distribution Center IP Address Sub-option
The CableHome 1.0 specification [2] specifies the Key Distribution CableHome specifications will specify the Key Distribution
Center network address encoding as a sub-option of the CCC DHCP Center network address encoding as a sub-option of the CCC DHCP
Option code. This field is used to inform the client device of the Option code. This field will be used to inform the client device of
network address of one or more Key Distribution Center servers. the network address of one or more Key Distribution Center servers.
The encoding of the KDC Server Address sub-option will adhere to the The encoding of the KDC Server Address sub-option will adhere to the
format of an IPv4 address using the default port. The minimum length format of an IPv4 address. The minimum length for this option is 4
for this option is 4 octets, and the length MUST always be a octets, and the length MUST always be a multiple of 4. If multiple
multiple of 4. If multiple KDC Servers are listed, they MUST be KDC Servers are listed, they MUST be listed in decreasing order of
listed in decreasing order of priority. The format of the KDC Server priority. The format of the KDC Server Address sub-option of the CCC
Address sub-option of the CCC option code is as shown below: option code is as shown below:
SubOpt Len Address 1 Address 2 SubOpt Len Address 1 Address 2
+------+-----+-----+-----+-----+-----+-----+-----+-- +------+-----+-----+-----+-----+-----+-----+-----+--
| 51 | n | a1 | a2 | a3 | a4 | a1 | a2 | ... | TBD | n | a1 | a2 | a3 | a4 | a1 | a2 | ...
+------+-----+-----+-----+-----+-----+-----+-----+-- +------+-----+-----+-----+-----+-----+-----+-----+--
3. Security Considerations 3. Security Considerations
This document relies upon the DHCP protocol [4] for authentication This document relies upon the DHCP protocol [4] for authentication
and security, i.e., it does not provide security in excess of what and security, i.e., it does not provide security in excess of what
DHCP is (or will be) providing. It does not expose any security DHCP is (or will be) providing. It does not expose any security
threats beyond what is currently exposed by other DHCP options. threats beyond what is currently exposed by other DHCP options.
4. IANA Considerations 4. IANA Considerations
The KDC Server Address sub-option described in this document is The KDC Server Address sub-option described in this document is
intended to be a sub-option of the CableLabs Client Configuration intended to be a sub-option of the CableLabs Client Configuration
(CCC) option described in [1]. IANA will be requested to register (CCC) option described in [1]. IANA is requested to assign and
sub-option code 51 of the CCC option to the KDC Server Address register a sub-option code of the CCC option to the KDC Server
sub-option. Address sub-option.
5. Normative References 5. Normative References
[1] "DHCP Option for CableLabs Client Configuration draft-ietf-dhc- [1] "DHCP Option for CableLabs Client Configuration draft-ietf-dhc-
packetcable-05", IETF, December 2002. packetcable-06", IETF, February 2003.
[2] "CableHome 1.0 Specification SP-CH1.0-I02-020920", CableLabs, [2] "CableHome 1.0 Specification SP-CH1.0-I03-030124", CableLabs,
September 2002, http://www.cablelabs.com/projects/cablehome/ January 2003, http://www.cablelabs.com/projects/cablehome/
specifications/. specifications/.
[3] Bradner, S., "Key words for use in RFCs to Indicate Requirement [3] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997. Levels", BCP 14, RFC 2119, March 1997.
[4] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, March [4] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, March
1997. 1997.
6. Authors' Addresses 6. Authors' Addresses
Kevin Luehrs Kevin Luehrs
CableLabs CableLabs
400 Centennial Parkway 400 Centennial Parkway
Louisville, CO 80027 Louisville, CO 80027
Phone: (303) 661-9100 Phone: (303) 661-9100
EMail: k.luehrs@cablelabs.com EMail: k.luehrs@cablelabs.com
Richard Woundy Richard Woundy
AT&T Broadband Comcast Cable
27 Industrial Drive 27 Industrial Drive
Chelmsford, MA 01824 Chelmsford, MA 01824
Phone: (978) 244-4010 Phone: (978) 244-4010
EMail: rwoundy@broadband.att.com EMail: richard_woundy@cable.comcast.com
John Bevilacqua John Bevilacqua
YAS Corporation YAS Corporation
300 Brickstone Square 300 Brickstone Square
Andover, MA 01810 Andover, MA 01810
Phone: (978) 749-9999 Phone: (978) 749-9999
EMail: john@yas.com EMail: john@yas.com
7. Full Copyright Statement 7. Full Copyright Statement
Copyright (C) The Internet Society (2002). All Rights Reserved. Copyright (C) The Internet Society (2003). All Rights Reserved.
This document and translations of it may be copied and furnished to This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph kind, provided that the above copyright notice and this paragraph
are included on all such copies and derivative works. However, this are included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of develop- Internet organizations, except as needed for the purpose of develop-
skipping to change at line 172 skipping to change at page 4, line 31
The limited permissions granted above are perpetual and will not be The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns. revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Acknowledgement
Funding for the RFC Editor function is currently provided by
the Internet Society.
 End of changes. 

This html diff was produced by rfcdiff 1.23, available from http://www.levkowetz.com/ietf/tools/rfcdiff/