Network Working Group A.K. Vijayabhaskar
Internet-Draft Hewlett-Packard
Expires: April 16, 2004 15 Oct 2003
NIS Configuration Options for DHCPv6
draft-ietf-dhc-dhcpv6-opt-nisconfig-03.txt
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Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This document describes four options for NIS-related configuration
information in DHCPv6: NIS Servers [3], NIS+ Servers [3], NIS Client
Domain Name [3], NIS+ Client Domain name [3].
1. Introduction
This document describes four options for configuration information
related to Network Information Service (NIS) in DHCPv6 [1].
2. Requirements
The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
document, are to be interpreted as described in RFC 2119 [2]
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3. Terminology
This document uses terminology specific to IPv6 and DHCPv6 as defined
in "Terminology" section of the DHCPv6 specification [1].
4. Network Information Service (NIS) Servers option
The Network Information Service (NIS) [3] Servers option provides a
list of one or more IPv6 addresses of NIS servers available to the
client. The NIS servers SHOULD be listed in the order of preference.
The format of the Network Information Service Servers option is as
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 (tbd)
option-len: Length of the 'NIS server' fields in octets; It must be
a multiple of 16
NIS server: IPv6 address of NIS server
5. Network Information Service V2 (NIS+) Servers option
The Network Information Service V2 (NIS+) [3] Servers option provides
a list of one or more IPv6 addresses of NIS+ servers available to
the client. The NIS+ servers SHOULD be listed in the order of
preference.
The format of the Network Information Service V2 (NIS+) Servers
option is as shown below:
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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 (tbd)
option-len: Length of the 'NIS+ server' fields in octets; It must be
a multiple of 16
NIS+ server: IPv6 address of NIS+ server
6. Network Information Service (NIS) Domain Name option
The Network Information Service (NIS) [3] 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 (tbd)
option-len: Length of the 'nis-domain-name' field in octets
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 [1].
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7. Network Information Service V2 (NIS+) Domain Name option
The Network Information Service V2 (NIS+) [3] 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 (tbd)
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 [1].
8. Appearance of these options
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 [1] in the following messages: Solicit, Request, Renew,
Rebind, Information-Request and Reconfigure.
9. Security Considerations
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.
To avoid attacks through these options, the DHCP client SHOULD use
authenticated DHCP (see section "Authentication of DHCP messages"
in the DHCPv6 specification [1]).
10. IANA Considerations
IANA is requested to assign an option code to the following options
from the option-code space defined in "DHCPv6 Options" section of the
DHCPv6 specification [1].
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Option Name Value Described in
OPTION_NIS_SERVERS tbd Section 4
OPTION_NISP_SERVERS tbd Section 5
OPTION_NIS_DOMAIN_NAME tbd Section 6
OPTION_NISP_DOMAIN_NAME tbd Section 7
11. Normative References
[1] Bound, J., Carney, M., Perkins, C., Lemon, T., Volz, B. and R.
Droms (ed.), "Dynamic Host Configuration Protocol for IPv6
(DHCPv6)", RFC 3315, July 2003.
12. Informative References
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[3] Sun Microsystems, "System and Network Administration",
March 1990.
Author's Address
Vijayabhaskar A K
Hewlett-Packard STSD-I
29, Cunningham Road
Bangalore - 560052
India
Phone: +91-80-2053085
E-Mail: vijayak@india.hp.com
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Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society. 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, Ralph Droms and Thomas
Narten for their thorough review.
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