Network Working Group A.K. Vijayabhaskar
Internet-Draft Hewlett-Packard
Expires: August 26, 2003 26 Feb 2003
NIS Configuration Options for DHCPv6
draft-ietf-dhc-dhcpv6-opt-nisconfig-02.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, NIS+ Servers, NIS Client Domain
Name, NIS+ Client Domain name.
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 section "Terminology" of the DHCP specification.
4. Network Information Service (NIS) Servers option
The Network Information Service Servers option provides a list of
one or more IP 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 (IP address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS server (IP 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: IP address of NIS server
5. Network Information Service V2 (NIS+) Servers option
The Network Information Service V2 (NIS+) Servers option provides
a list of one or more IP 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 (IP address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS+ server (IP 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: IP address of NIS+ server
6. Network Information Service (NIS) Domain Name option
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 (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+) 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 option
The NIS servers, NIS+ servers, NIS domain name and NIS+ domain name
options MUST appear only in the following messages: Solicit,
Advertise, Request, Confirm, 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, Confirm, 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 DHCP server to assign invalid NIS
parameters, resulting in clients unable to use NIS.
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 these options from the
option-code space defined in section "DHCPv6 Options" of the DHCPv6
specification [1].
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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)", draft-ietf-dhc-dhcpv6-28 (work in progress), November
2002.
12. Informative References
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
Author's Addresses
Vijayabhaskar A K
Hewlett-Packard ESD-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 Jim Bound and
Ralph Droms and Bernie Volz for their thorough review.
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