3898
PROPOSED STANDARD
Network Information Service (NIS) Configuration Options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
Authors: V. Kalusivalingam
Date: October 2004
Area: int
Working Group: dhc
Stream: IETF
Abstract
This document describes four options for Network Information Service (NIS) related configuration information in Dynamic Host Configuration Protocol for IPv6 (DHCPv6): NIS Servers, NIS+ Servers, NIS Client Domain Name, NIS+ Client Domain name. [STANDARDS-TRACK]
RFC 3898
PROPOSED STANDARD
Network Working Group V. Kalusivalingam
Request for Comments: 3898 Cisco Systems (India) Private Limited
Category: Standards Track October 2004
<span class="h1">Network Information Service (NIS)</span>
<span class="h1">Configuration Options for</span>
<span class="h1">Dynamic Host Configuration Protocol for IPv6 (DHCPv6)</span>
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2004).
Abstract
This document describes four options for Network Information Service
(NIS) related configuration information in Dynamic Host Configuration
Protocol for IPv6 (DHCPv6): NIS Servers, NIS+ Servers, NIS Client
Domain Name, NIS+ Client Domain name.
<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>. Introduction</span>
This document describes four options for passing configuration
information related to Network Information Service (NIS) [<a href="#ref-3" title=""System and Network Administration"">3</a>] in
DHCPv6 (<a href="./rfc3315">RFC 3315</a> [<a href="#ref-1" title=""Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"">1</a>]).
The options defined in this document can only be used to configure
information about NIS servers that can be reached using IPv6. The
DHCP option to configure information about IPv4 NIS servers can be
found in <a href="./rfc2132">RFC 2132</a> [<a href="#ref-4" title=""DHCP Options and BOOTP Vendor Extensions"">4</a>]. Mechanisms for configuring IPv4/IPv6 dual-
stack applications are being considered, but are not specified in
this document.
<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>. Terminology</span>
The key words MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL in this document are to be
interpreted as described in <a href="https://www.rfc-editor.org/bcp/bcp14">BCP 14</a>, <a href="./rfc2119">RFC 2119</a> [<a href="#ref-2" title=""Key words for use in RFCs to Indicate Requirement Levels"">2</a>].
<span class="grey">Kalusivalingam Standards Track [Page 1]</span><span id="page-2" ></span>
<span class="grey"><a href="./rfc3898">RFC 3898</a> NIS Configuration Options for DHCPv6 October 2004</span>
Throughout this document, unless otherwise specified, the acronym
DHCP refers to DHCP as specified in <a href="./rfc3315">RFC 3315</a>.
This document uses terminology specific to IPv6 and DHCP as defined
in section "Terminology" of <a href="./rfc3315">RFC 3315</a>.
<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>. Network Information Service (NIS) Servers Option</span>
The Network Information Service (NIS) Servers option provides a list
of one or more IPv6 addresses of NIS servers available to the client.
Clients MUST treat the list of NIS servers as an ordered list. The
server MAY list the NIS servers in the order of preference.
The format of the Network Information Service Servers option is as
shown below:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OPTION_NIS_SERVERS | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS server (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS server (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_NIS_SERVERS (27)
option-len: Length of the 'NIS server' fields in octets; It must be
a multiple of 16
NIS server: IPv6 address of NIS server
<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>. Network Information Service V2 (NIS+) Servers Option</span>
The Network Information Service V2 (NIS+) Servers option provides a
list of one or more IPv6 addresses of NIS+ servers available to the
client. Clients MUST treat the list of NIS+ servers as an ordered
list. The server MAY list the NIS+ servers in the order of
preference.
<span class="grey">Kalusivalingam Standards Track [Page 2]</span><span id="page-3" ></span>
<span class="grey"><a href="./rfc3898">RFC 3898</a> NIS Configuration Options for DHCPv6 October 2004</span>
The format of the Network Information Service V2 (NIS+) Servers
option is as shown below:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OPTION_NISP_SERVERS | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS+ server (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS+ server (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_NISP_SERVERS (28)
option-len: Length of the 'NIS+ server' fields in octets; It must be
a multiple of 16
NIS+ server: IPv6 address of NIS+ server
<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>. Network Information Service (NIS) Domain Name Option</span>
The Network Information Service (NIS) Domain Name option is used by
the server to convey client's NIS Domain Name info to the client.
The format of the NIS Domain Name option is as shown below:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OPTION_NIS_DOMAIN_NAME | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| nis-domain-name |
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_NIS_DOMAIN_NAME (29)
option-len: Length of the 'nis-domain-name' field in octets
<span class="grey">Kalusivalingam Standards Track [Page 3]</span><span id="page-4" ></span>
<span class="grey"><a href="./rfc3898">RFC 3898</a> NIS Configuration Options for DHCPv6 October 2004</span>
nis-domain-name: NIS Domain name for client
The 'nis-domain-name' MUST be encoded as specified in section
"Representation and Use of domain names" of the DHCPv6 specification
[<a href="#ref-1" title=""Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"">1</a>].
<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>. Network Information Service V2 (NIS+) Domain Name Option</span>
The Network Information Service V2 (NIS+) Domain Name option is used
by the server to convey client's NIS+ Domain Name info to the client.
The format of the NIS+ Domain Name option is as shown below:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OPTION_NISP_DOMAIN_NAME | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| nisp-domain-name |
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_NISP_DOMAIN_NAME (30)
option-len: Length of the 'nisp-domain-name' field in octets
nisp-domain-name: NIS+ Domain name for client
The 'nisp-domain-name' MUST be encoded as specified in section
"Representation and Use of domain names" of the DHCPv6 specification
[<a href="#ref-1" title=""Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"">1</a>].
<span class="h2"><a class="selflink" id="section-7" href="#section-7">7</a>. Appearance of these Options</span>
The NIS servers, NIS+ servers, NIS domain name and NIS+ domain name
options MUST NOT appear in other than the following messages:
Solicit, Advertise, Request, Renew, Rebind, Information-Request and
Reply.
The option number for these options MAY appear in the Option Request
Option [<a href="#ref-1" title=""Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"">1</a>] in the following messages: Solicit, Request, Renew,
Rebind, Information-Request and Reconfigure.
<span class="h2"><a class="selflink" id="section-8" href="#section-8">8</a>. Security Considerations</span>
The NIS servers, NIS+ servers, NIS domain name and NIS+ domain name
options may be used by an intruder DHCPv6 server to assign invalid
NIS parameters, resulting in clients unable to use NIS service.
<span class="grey">Kalusivalingam Standards Track [Page 4]</span><span id="page-5" ></span>
<span class="grey"><a href="./rfc3898">RFC 3898</a> NIS Configuration Options for DHCPv6 October 2004</span>
The NIS servers and NIS+ servers options may be used by an intruder
DHCPv6 server to cause the DHCPv6 clients to send their queries to an
intruder NIS/NIS+ server. This misdirected searches may be used to
spoof NIS/NIS+ names.
The NIS domain name and NIS+ domain name options may be used by an
intruder DHCPv6 server to cause the DHCPv6 clients to search through
invalid domains for incompletely specified domain names. The results
of these misdirected searches may be used to spoof NIS/NIS+ names.
To avoid attacks through these options, the DHCPv6 client SHOULD use
authenticated DHCP (see section "Authentication of DHCP messages" in
the DHCPv6 specification [<a href="#ref-1" title=""Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"">1</a>]).
<span class="h2"><a class="selflink" id="section-9" href="#section-9">9</a>. IANA Considerations</span>
The IANA has assigned option codes to the following options from the
option-code space defined in "DHCPv6 Options" section of the DHCPv6
specification [<a href="#ref-1" title=""Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"">1</a>].
Option Name Value Described in
OPTION_NIS_SERVERS 27 <a href="#section-3">Section 3</a>
OPTION_NISP_SERVERS 28 <a href="#section-4">Section 4</a>
OPTION_NIS_DOMAIN_NAME 29 <a href="#section-5">Section 5</a>
OPTION_NISP_DOMAIN_NAME 30 <a href="#section-6">Section 6</a>
<span class="h2"><a class="selflink" id="section-10" href="#section-10">10</a>. References</span>
<span class="h3"><a class="selflink" id="section-10.1" href="#section-10.1">10.1</a>. Normative References</span>
[<a id="ref-1">1</a>] Droms, R., Ed., Bound, J., Volz, B., Lemon, T., Perkins, C., and
M. Carney, "Dynamic Host Configuration Protocol for IPv6
(DHCPv6)", <a href="./rfc3315">RFC 3315</a>, July 2003.
[<a id="ref-2">2</a>] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", <a href="https://www.rfc-editor.org/bcp/bcp14">BCP 14</a>, <a href="./rfc2119">RFC 2119</a>, March 1997.
<span class="h3"><a class="selflink" id="section-10.2" href="#section-10.2">10.2</a>. Informative References</span>
[<a id="ref-3">3</a>] Sun Microsystems, "System and Network Administration", March
1990.
[<a id="ref-4">4</a>] Alexander, S. and R. Droms, "DHCP Options and BOOTP Vendor
Extensions", <a href="./rfc2132">RFC 2132</a>, March 1997.
<span class="grey">Kalusivalingam Standards Track [Page 5]</span><span id="page-6" ></span>
<span class="grey"><a href="./rfc3898">RFC 3898</a> NIS Configuration Options for DHCPv6 October 2004</span>
Acknowledgements
Thanks to the DHC Working Group for their time and input into the
specification. In particular, thanks to (in alphabetical order)
Bernie Volz, Jim Bound, Margaret Wasserman, Pekka Savola, Ralph
Droms, and Thomas Narten for their thorough review.
Author's Address
Vijayabhaskar A Kalusivalingam
Cisco Systems (India) Private Limited,
No: 9, Brunton Road,
Bangalore - 560025
India
Phone: +91-80-51036615
EMail: [email protected]
<span class="grey">Kalusivalingam Standards Track [Page 6]</span><span id="page-7" ></span>
<span class="grey"><a href="./rfc3898">RFC 3898</a> NIS Configuration Options for DHCPv6 October 2004</span>
Full Copyright Statement
Copyright (C) The Internet Society (2004).
This document is subject to the rights, licenses and restrictions
contained in <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a>, and except as set forth therein, the authors
retain all their rights.
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Intellectual Property
The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
made any independent effort to identify any such rights. Information
on the IETF's procedures with respect to rights in IETF Documents can
be found in <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a> and <a href="https://www.rfc-editor.org/bcp/bcp79">BCP 79</a>.
Copies of IPR disclosures made to the IETF Secretariat and any
assurances of licenses to be made available, or the result of an
attempt made to obtain a general license or permission for the use of
such proprietary rights by implementers or users of this
specification can be obtained from the IETF on-line IPR repository at
<a href="http://www.ietf.org/ipr">http://www.ietf.org/ipr</a>.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights that may cover technology that may be required to implement
this standard. Please address the information to the IETF at ietf-
[email protected].
Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
Kalusivalingam Standards Track [Page 7]
Annotations
Select text to annotate